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Book

Harry uses a flashlight for light instead.

Harry doesn't get any birthday presents and finds out later about the Weasley's journey to Egypt. Later, he is attacked by the Care of Magical Creatures book at the Leaky Cauldron.

Movie

Book

Aunt Marge stays for a single day.

Aunt Marge spends a few days at the Dursley house.

While serving food to the Dursleys, Harry accidentally inflates Aunt Marge.

Aunt Marge drifts out through the open doors and into the sky.

Aunt Marge rises to the ceiling but doesn't exit the house.

Sirius, while in the form of a black dog, form, growls and barks upon seeing Harry.

Movie

Book

When the conductor mentions not knowing Harry's name, Harry still doesn't give him one.

Harry uses Neville's name when speaking to the conductor.

At the front of the bus, there's a talking, shrunken head.

There isn't a shrunken head present.

This does not occur.

Harry requests that Fudge sign his Hogsmeade permission slip, but Fudge declines.

Harry remains at the Leaky Cauldron for a day. 

Harry resides at the Leaky Cauldron for a duration of two weeks.

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Book

Harry meets up with Ron and Hermione at the Leaky Cauldron, and Hermione has already bought Crookshanks.

Harry encounters Ron and Hermione in Diagon Alley. Together, they visit Magical Menagerie, where Hermione purchases Crookshanks.

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Book

This does not occur.

During the journey on the Hogwarts Express, Ginny, Neville, and Malfoy visit Harry's compartment.

Hogwarts has a choir that sings in front of the student body.

There is no choir performing at the Start of Term feast.

Movie

Book

Certain classes are excluded.

The three of them attend Transfiguration and Potions classes. During Transfiguration, McGonagall demonstrates her ability to transform into her animagus form.

Hermione takes hold of Ron's hand out of fear for Harry's safety during the Care of Magical Creatures class.

This is not present in the book.

Buckbeak flies Harry over the Black Lake, and Harry shouts in exhilaration.

Buckbeak glides over a section of the Forbidden Forest, but Harry still prefers flying on his broomstick.

A character named Bem occasionally makes unsettling remarks.

This character is not found in the books.

Movie

Book

Hermione seems to magically show up next to Harry and Ron in the Defense Against the Dark Arts class.

Hermione vanishes while they are heading to class, only to reappear a few feet behind them moments later.

Parvati Patil's boggart takes the form of a giant Snape, while Ron's transforms into a spider wearing roller skates when he uses the Riddikulus charm.

Parvati Patil's boggart transforms into a mummy, while Ron's changes into a spider that loses its legs when he uses the Riddikulus spell.

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Book

Following the attack on the Fat Lady, they locate her in a nearby portrait, where she talks about what transpired.

Peeves recounts what occurred to the Fat Lady.

Sir Cadogan assumes the Fat Lady's duties while she recuperates.

When Harry is unable to go to Hogsmeade, he spends time with Lupin on the Wooden Bridge, discussing his mother, Lily.

When Harry is unable to go to Hogsmeade, he spends time in Lupin's office where he encounters a Grindylow. Lupin also reminisces about his friends, James and Lily Potter

Movie

Book

When Snape teaches Defense Against the Dark Arts, he utilizes a projector and refers to Hermione as a know-it-all.

There isn't a projector used when Snape teaches Defense Against the Dark Arts. He deducts points from Gryffindor because Harry is late, Hermione answers questions correctly, and he gives Ron detention for defending Hermione.

The Quidditch team wears goggles when it rains.

Hermione casts a spell to help Harry see clearly during his Quidditch match in the rain.

Katie Bell crashes into the stands with her broom ablaze. The Hufflepuff seeker is struck by lightning, and then Harry falls off his broom. The match ends without anyone catching the snitch.

Katie Bell avoids crashing into the stands. After Harry falls off his broom, Cedric, the Hufflepuff seeker, catches the snitch.

Movie

Book

Harry visits Hogsmeade once and overhears Fudge revealing that Sirius is his godfather while he is alone.

Harry goes to Hogsmeade on two occasions, and both Ron and Hermione are with him when he overhears Fudge revealing information.

There is a scene where Harry displays anger.

Harry remains angry for several days.  

Movie

Book

Harry receives the Firebolt right at the conclusion of the movie.

Harry gets the Firebolt for Christmas, but Hermione is worried that it isn't safe. She tells McGonagall, who takes it away to check it thoroughly.

Movie

Book

Harry uses a memory of his parents as his happy thought to protect himself from the Dementors, although he's uncertain about its authenticity.

Movie

Book

The scene where all the Gryffindors gather in the common room after the attack was featured in a deleted scene

Sirius attempts to kill Wormtail, who is disguised as Scabbers, one night while Ron is asleep with him. Ron wakes up to discover his curtains slashed.

This match isn't included, and Harry doesn't meet Cho until the following movie.

Harry encounters Cho during the Gryffindor-Ravenclaw Quidditch match.

Movie

Book

Harry, under the Invisibility Cloak, surprises Malfoy and his friends by pelting them with snowballs. Ron and Hermione are present, and they find this hilarious.

Snape confiscates the map from Harry after catching him wandering the corridors alone at night.

Snape catches Harry and Ron leaving the One-Eyed Witch Passage and confiscates Harry's map. Ron tries to cover for them by claiming they obtained the map from Zonko's Joke Shop.

The map contains a single insulting message directed at Snape.

Each of the Marauders has a disrespectful message intended for Snape.

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Book

Hermione draws her wand and then punches Malfoy.

Hermione slaps Malfoy.

This doesn’t happen.

On their way to Charms, Hermione disappears. Harry and Ron later find her asleep on a book in Gryffindor tower.

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Book

Harry overhears Trelawney's prophecy while returning a crystal ball to her classroom.

Trelawney's prophecy occurs while Harry is taking his exam.

While visiting Hagrid, the trio are indoors when someone throws rocks to get their attention. They notice Dumbledore, Fudge, and the executioner approaching them.

While visiting Hagrid, the trio go to his garden to comfort Buckbeak. Hagrid spots Dumbledore, Fudge, and the executioner approaching them.

Movie

Book

After witnessing Buckbeak's execution, Hermione embraces Ron and begins to cry.

This does not happen in the book.

Crookshanks appears only briefly in the movie, mainly when Ron mentions that she has been attacking Scabbers.

Crookshanks displays trust towards Sirius in his animagus form but attacks Scabbers because she can distinguish between good and evil.

When Ron is captured, he is in a state of panic while Hermione remains composed.

When Ron is captured, he remains composed while Hermione becomes more anxious.

Sirius injures Ron's leg while pulling him away.

Sirius pulls Ron by the arm, and his leg is broken when a branch from the Whomping Willow strikes him.

Hermione declares, "If you want to kill Harry, you'll have to kill us too!"

Ron utters the line, "If you want to kill Harry, you'll have to kill us too!"

Hermione says, "I trusted you, and all this time you've been his friend."

Harry says, "I trusted you, and all this time you've been his friend."

Lupin saw Pettigrew's name on the map after taking it, which led him to the Shrieking Shack. Harry himself never saw Pettigrew's name on the map.

Movie

Book

The backstory of the Marauders, their connection to the Shrieking Shack, and the Whomping Willow is disclosed.

Snape enters the room at the Shrieking Shack normally.

Snape used the Invisibility Cloak to enter the Shrieking Shack.

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Book

Snape remains calm.

Snape restrains Lupin, threatens to suspend Hermione, and tells Harry he deserves to be killed by Sirius.

Harry is the sole person who attacks Snape.

The trio casts the disarming charm on Snape simultaneously.

Sirius has to wrestle Scabbers out of Ron's grasp.

Ron relinquishes Scabbers willingly.

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Book

The werewolf appears as a tall, thin creature walking on two legs.

Snape positions himself in front of Harry, Ron, and Hermione to shield them from Lupin.

Since Snape is still unconscious, he never positions himself between Lupin and the trio.

Harry pursues Sirius alone, and they encounter the Dementors.

Harry and Hermione pursue Sirius, and all three are attacked by Dementors.

Pettigrew does not harm anyone when he escapes.

Ron is knocked unconscious by Pettigrew.

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Book

Ron witnesses Harry and Hermione using time travel.

Ron is unconscious and does not witness their time travel.

After using the time turner, Harry and Hermione are still in the Hospital Wing.

The time turner transports them to the Entrance Hall.

Hermione throws a rock through Hagrid's window and calls out to get Lupin's attention. She is with Harry when he casts the Patronus.

Hermione does not throw a rock through Hagrid's window or call out to distract Lupin. She is also not present with Harry when he casts the Patronus.

Dumbledore informs Harry and Hermione that Sirius is imprisoned in a cell at the top of the Dark Tower.

Sirius is confined in Professor Flitwick's office.

Hermione uses the spell Bombarda to break Sirius out.

Hermione uses Alohomora to unlock Sirius's cell door.

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Book

Lupin mentions that rumors about his condition have circulated, and Harry expresses remorse over Pettigrew's escape.

During Harry and Lupin's last conversation, Lupin discloses that Snape was the one who revealed his condition to others. Dumbledore joins them, and Harry expresses regret for not allowing Sirius and Lupin to capture Pettigrew. They also discuss Trelawney's prophecy.

This event does not occur.

Ron receives an owl named Pigwidgeon as a gift from Sirius to replace Scabbers.

This scene does not appear in the movie.

Sirius signs Harry's permission slip so that he can visit Hogsmeade.

The movie concludes with Harry receiving the Firebolt and taking it for a flight.

The book concludes with Harry returning to the Dursleys' home, where he informs Vernon about his godfather who escaped from prison.