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The movie opens with Harry in the park, where Dudley and his friends come over to him.

The story starts prior to Harry arriving at the park, where Dudley approaches Harry by himself.

The Dementors ambush them in a tunnel.

The Dementors assault them in a narrow passage between buildings.

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Book

Mrs. Figg informs Harry that Dumbledore requested that she watch over him.

Mrs. Figg informs Harry that Mundungus Fletcher was supposed to be keeping an eye on him that evening.

Harry receives a howler announcing that he has been expelled.

Harry receives several letters, including one from Kingsley Shacklebolt, informing him that his expulsion has been temporarily halted due to Dumbledore's intervention.

Petunia does not receive any letters.

Petunia receives a letter from Dumbledore that reads, "Remember my last, Petunia." This message frightens her.

Petunia demonstrates little familiarity with the Wizarding World.

Petunia is aware of Azkaban and Dementors.

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That night, the members of the Order of the Phoenix arrive to take Harry with them.

Harry writes a letter to Hermione, Ron, and Sirius. Three days later, the members of the Order of the Phoenix arrive to collect Harry.

Moody doesn't appear to mind when Harry addresses him as "Professor."

Moody seems displeased when Harry calls him "Professor," likely because he had been imprisoned and unable to fulfill his teaching role in Harry's previous year.

Lupin is not among the group that comes to fetch Harry.

Lupin is included in the group that arrives to collect Harry.

The group makes a brief remark about Muggles and then departs without much concern.

The group is careful about flying and avoid Muggle detection.

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Harry is frustrated that he hasn't received any letters from Ron and Hermione.

Harry is upset and raises his voice at Ron and Hermione because they were able to go to Grimmauld Place while he was stuck at the Dursleys'.

Harry only loses his temper once with Dumbledore later on.

Harry's tendency to snap at his friends in anger becomes a common occurrence throughout the book.

The trio and the Weasley twins use an Extendable Ear to listen in on the Order's meeting.

They use an Imperturbable Charm to listen in on the meeting covertly.

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Kreacher is depicted cleaning Sirius's mother's portrait and addressing her as "mistress."

At Grimmauld Place, there is a painting of Sirius's mother that frequently screams loudly.

Ginny attends the meeting. Mrs. Weasley argues with Sirius briefly but soon gives in.

Mrs. Weasley prevents Ginny from participating in the meeting where everyone updates Harry. She also argues with Sirius for a longer time regarding Harry's inclusion in the discussion.

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This chapter doesn't appear in the movie adaptation.

Harry stays at Grimmauld Place for a few days, assisting in cleaning the house and preparing it for the Order's use.

Harry and Sirius examine the Black family tree here.

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Harry and Arthur bypass visiting his office and head directly to the hearing.

Harry and Arthur Weasley visit Arthur's office at the Ministry first.

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Harry and Arthur were unaware that the time of the hearing had been changed.

Harry and Arthur were unaware that the hearing would take place in front of the entire Wizengamot.

Fudge calmly declares Harry innocent of all charges.

Fudge can hardly conceal his anger as he exonerates Harry of all charges.

Movie

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None of this appears in the movie adaptation.

Ron and Hermione become Prefects, and Harry feels envious that Ron received the position instead of him. Ron's parents reward him with a new broomstick as a gift.

Sirius gives Harry a photograph of the Order at the train station.

Mrs. Weasley presents Harry with the photo of the Order.

This scene is not included in the movie adaptation.

Harry sees Molly Weasley deeply upset after attempting to banish a boggart that transformed into deceased members of her family..

Percy's loyalty is subtly shown later on when he is among the group that apprehends Dumbledore's Army.

It's mentioned that Percy is more loyal to the Ministry than his family. He ends up disowning them.

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Ginny introduces Harry to Luna aboard the train.

Only Harry and Luna are able to see the Thestrals.

Neville can also see the Thestrals.

Hermione is unaware of what Harry is witnessing.

Hermione understands what Thestrals are, even though she cannot see them herself.

Book

The Sorting Hat sings a new song.

Movie

Book

The movie skips directly to Harry's first Defense Against the Dark Arts class.

Harry attends various classes before Defense Against the Dark Arts.

Only the trio confront Umbridge about their inability to learn defensive magic.

The trio, along with Dean Thomas and Parvati Patil, all argue against Umbridge.

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Harry receives a one-day detention.

Harry is given a two-week detention.

Hermione finds the writing on Harry's hand and encourages him to inform Dumbledore or McGonagall about it.

Ron finds the writing on Harry's hand instead.

No other classes are depicted.

Harry and his friends attend other classes, such as Care of Magical Creatures.

This is not included.

Hermione persistently attempts to free the house-elves by discreetly leaving clothing in various locations.

Ron doesn't join the Gryffindor Quidditch team until the sixth film.

Ron tries out and joins the Gryffindor Quidditch team.

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This does not occur.

Ron receives a letter from Percy that criticizes Harry, Dumbledore, and their parents.

The trio and Sirius only discuss Hogwarts and the Order of the Phoenix.

The trio converse with Sirius through the fireplace. They mention that Hagrid is missing, update him on Hogwarts affairs, and discuss the possibility of visiting him in person.

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McGonagall questions Umbridge about her harsh methods of discipline.

This does not occur.

Umbridge holds a public event in the courtyard to dismiss Trelawney.

There is no public dismissal.

The movie skips this part and immediately shows Harry agreeing.

Both Hermione and Ron spend time persuading Harry to teach them Defense Against the Dark Arts.

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The students raise some questions and voice a few doubts during the meeting, but overall, it proceeds smoothly.

More students, especially Zacharias Smith, express skepticism and doubt towards Harry and his story.

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This does not occur.

Umbridge almost catches the trio conversing with Sirius.

This is not included.

Hedwig is attacked, leading them to suspect that someone is trying to intercept Harry's letters.

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Hermione never questions the idea of training on their own.

After Sirius agrees that training on their own is a good idea, Hermione begins to have doubts about it.

Neville discovers the Room of Requirement.

Dobby guides them to the Room of Requirement.

Ginny's relationship status is not discussed, and she acts the same around Harry.

Ginny dates Michael Corner and gradually becomes more at ease around Harry.

Padma Patil is depicted as a Gryffindor student.

Padma Patil is a Ravenclaw student.

Hermione defeats Ron in a duel.

Ron wins against Hermione three times in their duel.

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The movie doesn't feature any Quidditch scenes, and Ron doesn't become the Keeper until the next film.

In this chapter, Ron takes on the role of Keeper, and throughout the year, the Slytherins mock him. With Oliver Wood no longer around, Angelina Johnson steps up as captain. Malfoy taunts Harry and the Weasley twins by insulting Mrs. Weasley, which leads to Harry and George attacking him. As a result, Harry and the twins are permanently banned from playing Quidditch. Ginny then takes over as Seeker following Harry's ban.

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The trio visits Hagrid when he comes back and spends the day chatting with him.

The trio sneaks out at night under the Invisibility Cloak and listens in on a conversation between Umbridge and Hagrid. She later spots their footprints in the snow.

Hagrid briefly mentions that he was sent to negotiate with the giants.

Hagrid describes how he and Madame Maxime traveled to find and speak with the giants.

Luna explains Thestrals to Harry.

Hagrid gives a lesson on Thestrals.

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Harry dreams that Mr. Weasley is being attacked. He gets frustrated with Dumbledore for not listening to him, and Snape then takes him to his first Occlumency lesson.

After having the dream, Harry and the others are transported to Grimmauld Place using a Portkey.

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The trio never visit the hospital, and Mr. Weasley is brought back to Grimmauld Place.

The Weasley family goes to St. Mungo's Hospital to visit Mr. Weasley.

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This does not occur.

Harry is concerned that he poses a threat to others and contemplates leaving. During a conversation with Ginny, they reflect on her past experience with Tom Riddle, which reassures Harry.

Lockhart is not in the movie, and Neville confides in Harry about his parents while they are in the Room of Requirement.

The trio encounter Lockhart at St. Mungo's Hospital. Harry also meets Neville there, who is visiting his parents and reveals to Harry that they were tortured by Death Eaters.

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This does not occur.

Snape visits Grimmauld Place to update Harry on his Occlumency lessons. He also informs Harry that Lucius Malfoy identified Sirius at the train station.

The Knight Bus does not appear in this movie.

The three of them ride the Knight Bus to Hogsmeade in order to return to Hogwarts.

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Harry goes on a date with Cho, but she becomes upset when he leaves to meet Luna and Hermione.

Cho is in the same school year as Harry.

Cho is one year ahead of Harry.

Rita Skeeter does not appear in this film.

Rita Skeeter conducts an interview with Harry for the Quibbler.

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There is no interview, but the newspaper mentions the massive breakout.

Rita Skeeter's interview with Harry, along with the coverage of the massive Azkaban breakout, helps to persuade people that Harry and Dumbledore's claims are genuine.

No additional visions are depicted.

Harry experiences several visions, one of which involves Augustus Rookwood revealing to Voldemort how to access the Department of Mysteries.

No one takes over for Trelawney.

Firenze the centaur arrives at Hogwarts to take over Divinations after Trelawney's departure.

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Neville has a hard time mastering the spell Expelliarmus.

Neville already knows how to cast Expelliarmus and is eager to learn more advanced spells from Harry.

Umbridge blasts a hole in the wall and apprehends all the members of Dumbledore's Army.

Dobby warns the members of Dumbledore's Army, allowing others to escape so only Harry is caught. Nevertheless, they identify all the members through the list Hermione had everyone sign.

Cho inadvertently reveals information about the DA under the influence of truth serum, leading Harry to end their relationship before understanding the complete situation.

Cho's close friend, Marietta Edgecombe, betrays the DA. Harry decides to end his relationship with Cho when she defends Marietta's actions.

This is not part of the story.

The parchment Hermione had everyone sign is enchanted. The betrayer has the word "SNEAK" appear on their forehead.

Dumbledore manages to escape without any confrontation.

Dumbledore engages in a brief duel with Fudge and the the Aurors before successfully escaping.

The members of Dumbledore's Army are assigned detention in the Great Hall.

This is not included in the book.

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Harry glimpses Snape's memories when he casts Protego.

Harry views Snape's memories stored in a Pensieve.

Snape's memories include instances of James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew bullying him.

Snape's memories show him being bullied and the end of his friendship with Lily.

Harry stands up for his father and his behavior.

Harry struggles to justify his father's actions and is uncertain about how his parents came to be together.

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This is not part of the story.

In this chapter, students meet with their Head of House to discuss their careers after Hogwarts. Umbridge attends Harry and McGonagall's meeting and asserts that Harry will never become an Auror. McGonagall defends Harry, pledging her support and assistance in his ambitions.

This does not occur in the storyline.

Harry sneaks into Umbridge's office to use her fireplace and communicate with Sirius and Lupin about his father's actions. They provide reassurance.

Fred and George depart during the fifth year's O.W.L.s, using fireworks that target Umbridge and her supporters.

Fred and George depart Hogwarts earlier. They leave behind a swamp, hidden caches of their magical sweets that cause various ailments, and detailed instructions for Peeves to create chaos throughout the school.

Professor Flitwick is depicted celebrating the chaos caused by the Weasley twins as they depart.

The professors refrain from removing the swamp, finding enjoyment in watching Umbridge and Filch struggle to clean it up.

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Hagrid leads Harry, Ron, and Hermione to meet Grawp. During their encounter, Grawp picks up Hermione, and they observe Centaurs running nearby.

Since Ron is in a Quidditch match, only Hermione and Harry venture to meet Grawp. During their visit, Grawp attempts to grab Hermione but he is unsuccessful. They talk to the Centaurs.

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This scene is not part of the movie.

Umbridge and her Aurors launch an attack on Hagrid, prompting Professor McGonagall to defend him. This altercation results in Hagrid deciding to leave the school.

While standing amidst the cheering crowd on the day the Weasley twins depart, Harry has a vision of Voldemort torturing Sirius.

During his History of Magic O.W.L., Harry falls asleep and sees a vision of Voldemort attacking Sirius.

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The trio rush to Umbridge's office to use her Floo Network while she is preoccupied with the aftermath of the Weasley twins' fireworks.

Neville, Luna, Ginny, Ron, and Hermione create a distraction to allow Harry to sneak away and check if Sirius is at Grimmauld Place.

This event does not occur in the story.

Harry talks to Kreacher, who deceives him by claiming that Sirius has gone to the Department of Mysteries and will not return.

The identity of the individual who sent the Dementors is never disclosed.

They discover that Umbridge was the one who sent the Dementors after Harry and Dudley.

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Umbridge doesn't do this.

Umbridge insisted that Harry and Hermione proceed ahead of her, implying that her life held greater value.

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The movie does not depict any additional rooms.

The group discovers rooms such as the Brain Room and Time Room within the Department of Mysteries.

Others mention that only Harry can hear the prophecy but do not provide an explanation for this restriction.

A person named Broderick Bode attempted to touch the prophecy but was cursed and suffered spell damage as a result.

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The Death Eaters have captured Harry's friends and are holding them hostage.

Harry's friends are not held hostage, but they are incapacitated in some manner. Bellatrix uses the Cruciatus Curse on Neville.

The archway appears as a translucent mist.

The archway is adorned with a black veil.

After Sirius punches Lucius, he drops the prophecy, causing it to shatter.

The prophecy shatters when it falls out of Neville's pocket as he attempts to escape.

Bellatrix murders Sirius using the killing curse.

Bellatrix pushed Sirius into the veil.

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In the midst of the battle, Dumbledore encloses Voldemort in a sphere of water.

In the battle between Voldemort and Dumbledore, Dumbledore conjures a fiery rope, transfigures statues, and is aided by Fawkes.

Voldemort takes control of Harry's body to taunt Dumbledore.

Voldemort inhabits Harry's body and attempts to persuade Dumbledore to kill him, thus sacrificing Harry.

This is not depicted.

Dumbledore sends Harry back to his office at Hogwarts using a Portkey.

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Harry doesn't destroy Dumbledore's Office.

Harry is deeply distraught after Sirius's death and damages Dumbledore's office in a fit of dispair.

Harry hears the prophecy when he makes contact with the orb.

Harry never had the opportunity to hear the prophecy firsthand, so Dumbledore shows it to him through a memory in the Pensieve.

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The reinstatement of Dumbledore, the suspension of Umbridge, and Fudge's retirement are depicted through clips from the Daily Prophet.

After the events, Harry stays at Hogwarts for a few more days to process everything. News then spreads that the Dementors have joined Voldemort's side. Umbridge is driven away from Hogwarts by Peeves, who hits her on the head with a walking stick gifted to him by Professor McGonagall. Harry seeks solace by talking to Nearly Headless Nick and inquiring about the possibility of Sirius returning as a ghost.

The movie concludes with a hopeful scene as Harry walks with his friends to catch the train.

The book concludes with Harry returning to the Dursleys' home. Moody, Lupin, and Tonks warn the Dursleys not to mistreat Harry.