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The movie begins with the Dursleys getting ready for the Mason family arrival.

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Dobby is bouncing on Harry's bed.

Dobby suggests that Voldemort might be responsible for the troubling events expected to occur at Hogwarts.

Dobby uses magic and drops the cake in the kitchen, causing it to explode all over Harry.

The Masons depart after Mrs. Mason, who is frightened of owls, spots one delivering a letter.

Vernon instructs a worker to install bars on Harry's window.

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Harry packs his trunk and Hedwig into the flying car. Vernon, awakened by the noise of the bars breaking, grabs Harry's leg and tumbles out of the window, landing in the hedges below.

This is not stated.

On their way to the Burrow, one of the Weasleys suggests that Dobby might be a servant of the Malfoys.

This does not occur.

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Book

Arthur asks Harry to explain the purpose of a rubber duck.

Arthur questions Harry about escalators.

A similar deleted scene is included, but it is not present in the standard version of the movie.

Harry catches Draco and his father negotiating a sale with the owner of Flourish and Blotts.

Hermione fixes Harry's glasses.

Mrs. Weasley fixes Harry's broken glasses.

Arthur and Lucius engage in a heated verbal argument.

Arthur Weasley gets into a physical altercation with Lucius Malfoy.

Gringotts does not appear in the movie.

Harry and Ron visit Gringotts and Harry feels guilty about the wealth he possesses.

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Book

While using the flying car to reach Hogwarts, Harry and Ron narrowly avoid being hit by the train, and Harry almost falls out of the car.

This does not occur.

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Book

The howler message is not depicted as transforming into lips, and its message is significantly longer.

 Flames erupt from the howler.

 Lockhart suggests that he knows more about fixing the Whomping Willow than Professor Sprout. Later, Lockhart lectures Harry about the appropriateness of giving out autographs when Collen requests one.

Justin Finch-Fletchley attempts to befriend Harry during Herbology class.

Lockhart dives right into the lesson, but the quiz is featured in a deleted scene.

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Book

Hermione is unfamiliar with the term and it's Ron who explains its meaning to her and Harry.

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Book

The Deathday Party is not featured in the movie. Instead, Harry hears voices during detention with Lockhart and later discovers Mrs. Norris after the incident.

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Movie

Book

Hermione discovers the recipe for Polyjuice Potion in an ordinary book.

Hermione has to get a note signed by Lockhart so they can get the book from the restricted section.

On a sunny day, the Bludger chases Harry as he races Malfoy for the snitch.

The Quidditch match happens on a rainy day and Harry catches the snitch before Malfoy notices it. There is no chase scene.

The entire team, plus Harry’s friends, are in the Hospital Wing to see Harry and Madam Pomprey demands that they get out of her way.

Ron and Hermione are with Harry in the Hospital Wing. When the team shows up to check on him, Madam Pomprey kicks them out.

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Book

This does not occur.

In a deleted scene, Harry overhears people whispering about him.

Harry speaks Parseltongue, and to the audience, it sounds like hissing noises. What Harry thinks he is saying is not conveyed to the audience.

When Harry speaks Parseltongue, the reader sees it from Harry's perspective, understanding his words. However, Harry learns from his friends later that to them, it sounded like mere hissing.

Nearly Headless Nick is floating upright, white, and emitting smoke when he is petrified.

Nearly Headless Nick appears floating horizontally and blackened when petrified.

Filch discovers Harry shortly after Justin's attack

Peeves discovers Harry after Justin's attack.

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Harry spots the Sorting Hat on a shelf in Dumbledore’s office and questions whether he's been placed in the correct house.

The trio each drink the potion in their own stalls, and the transformation is described as agonizing.

Harry and Ron's voices change to match Crabbe and Goyle. Additionally, Harry's eyesight improves.

These details are absent from the movie. However, Malfoy has a package that is not mentioned in the book.

Malfoy shows them an article about Arthur Weasley's inquiry and the Ministry. He mentions Dumbledore's fondness for Muggle-borns and mocks Colin Creevy.

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Professor McGonagall tells the class about the Chamber of Secrets.

Professor Binns, the History of Magic teacher, discusses the Chamber of Secrets during class.

This does not occur in the movie.

In the book, Professor Lockhart organizes a Valentine's Day breakfast.

Harry discovers the diary in Moaning Myrtle's bathroom.

Harry receives a Valentine and Malfoy attempts to steal Tom Riddle's diary. Harry uses a spell to disarm Malfoy and is reprimanded by Percy.

The ink inside the diary is dark.

Harry finds himself on the Grand Staircase, where he witnesses Myrtle's body being carried away. Tom Riddle speaks to Dumbledore, who discusses the possibility of the school closing. 

When Harry is transported into the past, he finds himself in the Headmaster's office where Professor Dippet reads a letter from Tom Riddle. Dippet informs Tom about the potential closure of the school. Tom then briefly converses with Dumbledore.

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McGonagall personally approaches the Quidditch team, and they appear less distressed about what's happening.

McGonagall cancels the Gryffindor-Hufflepuff match using a megaphone, and the team is visibly upset.

There is no reference to Ginny behaving oddly in the movie.

Ginny attempts to confide in Ron and Harry about her secret. Throughout the book, it is noted that Ginny behaves strangely whenever there is an attack.

This character is not part of the story.

The line about the rooster's crow being fatal to the Basilisk is not included. However, earlier in the film, Hagrid bursts into Dumbledore's office holding a dead rooster.

Hagrid's roosters are killed. There is a line stating that "the crowing of the rooster is fatal to the Basilisk."

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They first spot the spiders while in Herbology class one day. They then wait until everyone is asleep to sneak out of their dormitory.

Ron is frightened of spiders and remains scared throughout the entire journey. At one point, he even remarks, "Why couldn't we follow the butterflies?" as they venture further into the forest.

Ron has a fear of spiders but shows considerable bravery. Ron's comment about following butterflies isn't found in the book.

Harry and Ron discover the lair by themselves.

Harry and Ron get lost and are dragged into the spiders' lair.

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Harry and Ron eavesdrop on the teachers in the corridor and witness the writing firsthand.

Harry and Ron are concealed in a wardrobe when they overhear the teachers in the Staffroom discussing the final message and deciding to appoint Lockhart to find the Basilisk

During their confrontation with Lockhart, Harry and Ron aim their wands at him, causing him to drop his own wand.

They cast the disarming charm on Lockhart and toss his wand out of a nearby window.

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After being blinded, the Basilisk relies on its keen sense of hearing to locate Harry.

After being blinded, the Basilisk uses its sense of smell to track down Harry.

The Basilisk pursues Harry through tunnels, and eventually, Harry climbs onto the statue of Salazar Slytherin and manages to stab the Basilisk.

Harry's encounter with the Basilisk unfolds swiftly, and he does not climb onto the statue during their confrontation.

The Sword of Gryffindor materializes from the hat lying on the ground.

Harry puts on the hat. Suddenly, the sword falls out, accidentally hitting Harry on the head.

Harry repeatedly stabs the diary, causing Tom to burst into a blinding light. After Ginny awakens, Fawkes heals Harry.

Fawkes heals Harry's arm, and then Harry destroys the diary with a single decisive stab. Tom Riddle writhes and then vanishes.

Fawkes transports everyone out of the cave's mouth. The scene transitions to Dumbledore's office.

They find themselves back in Myrtle's bathroom and proceed to McGonagall's office.

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Harry and Ron are in McGonagall's office, where Arthur, Molly, and Dumbledore are also present.

This scene is not depicted in the movie adaptation.

Dumbledore awards them 200 points each for saving Ginny.

There is no mention of what happens to Lockhart. Dumbledore sends Ron with papers to mail to ensure Hagrid’s release from Azkaban.

Dumbledore requests that Ron escort Lockhart to the hospital.

Harry chases after Lucius and confronts him in the corridor.

Harry faces off against Lucius in Dumbledore’s office, with the headmaster present.

Harry places a sock inside the diary, and then he gives it to Dobby.

Harry places the diary inside a sock. When Lucius throws the sock, Dobby catches it.

This is excluded.

Gryffindor emerges victorious in the house cup competition.

Hermione embraces only Harry.

Hermione embraces both Harry and Ron in a hug.

Hagrid explains that he's late because the bird carrying his release papers got lost.

This occurrence is absent in the book.