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The scene starts with Dumbledore using the Deluminator while conversing with McGonagall. There is no reference to Muggles observing any unusual occurrences.

The scene opens with Vernon Dursley observing unusual sights, including odd people, owls, and a cat, while he's at work at Grunnings.

McGonagall refers to him as “You-Know-Who.”

McGonagall uses Voldemort’s name.

Hagrid does not reveal the source of the flying bike.

Hagrid reveals that the bike belongs to Sirius Black.

Aunt Petunia and Dudley both have dark hair.

Aunt Petunia and Dudley both have blonde hair.

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Harry accompanies Dudley, Vernon, and Petunia to the zoo with minimal fuss.

They attempt to have Mrs. Figg, Vernon’s sister Marge, or Petunia’s friend look after Harry, but all are unavailable. They end up taking Harry with them reluctantly. Dudley’s friend, Piers Polkiss, is also present.

The snake is native to Burma.

The snake originates from Brazil.

As the snake slithers away, it expresses its gratitude to Harry by saying “thanks.”

As the snake departs, it says, “thanks, amigo.”

The glass suddenly reappears, locking Dudley inside the reptile house.

The glass stays missing, and the reptile house keeper asks what happened to it.

As he locks Harry in the cupboard, Vernon declares, “There’s no such thing as magic.”

Vernon is so enraged that he can barely articulate his words, stammering, “Go—cupboard—stay—no meals.”

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Dudley is suspicious of Harry, as though he senses that Harry is different.

Dudley is completely clueless about what's happening, just as oblivious as Harry.

Harry isn't given Dudley's second bedroom until after his first year at Hogwarts, as noted at the beginning of the second movie.

Harry moves into Dudley’s second bedroom, and the address on his letters is updated.

The movie depicts Vernon burning the letters and sealing the mail slot.

Vernon sleeps in front of the door to intercept the letters, and Harry accidentally steps on his face.

Vernon takes Harry and his family directly to the island hut.

Vernon first pulls into a hotel and repeatedly halts the car to look for a hiding spot.

The way they arrived at the island hut is not depicted.

An elderly man with no teeth rows them to the island hut.

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At first, Hagrid confuses Dudley for Harry.

Hagrid instantly recognizes Harry.

Hagrid bends the gun, causing it to discharge.

Hagrid takes the gun and twists it into a knot.

Hagrid brings a birthday cake for Harry.

Hagrid doesn’t bring a cake but instead cooks sausages for Harry.

Hagrid sees Dudley eating Harry’s cake and angrily curses him with a pig's tail.

Hagrid curses Dudley in response to Vernon's insult towards Dumbledore.

Hagrid merely says that he isn’t allowed to perform magic.

Hagrid informs Harry that he was expelled from Hogwarts.

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Hagrid doesn't explain how Harry's parents died until after their visit to Diagon Alley.

Hagrid reveals to Harry at the hut the details about Voldemort and how his parents died.

Quirrell wears a turban and declines to shake Harry’s hand when they first meet.

When they first meet, Quirrell isn't wearing a turban and shakes Harry’s hand.

Harry is by himself when he receives his wand, and Hagrid later arrives with Hedwig as a birthday gift.

Hagrid accompanies Harry to Ollivanders, where he sits in a chair and accidentally breaks it. Later, Harry goes with Hagrid to get an owl, choosing the name Hedwig from a History of Magic book.

Harry tries two wands before he finds the right one.

Harry tries numerous wands.

Harry doesn't encounter Draco Malfoy until they arrive at Hogwarts.

Harry first encounters Draco Malfoy at Madam Malkin’s in Diagon Alley.

Harry learns about Quidditch during his first flying lesson.

Draco explains Quidditch to Harry when they first meet.

After collecting his supplies, Hagrid takes him directly to King’s Cross Station.

Harry goes back to live with the Dursleys for a month, and Vernon takes him to King’s Cross Station.

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Harry only glimpses Fred and George from afar.

Harry encounters Fred and George on the platform, and they assist him in loading his trunk onto the train. Afterward, they excitedly inform their family about meeting him.

When Ron sits with Harry, he doesn't recognize who Harry is.

When Ron sits down with Harry, he already knows who Harry is.

Harry sees Flamel’s name on Dumbledore’s chocolate frog card.

Harry doesn't discover who Flamel is until Hermione finds his name in a book.

Hermione visits the compartment to ask if they’ve seen a frog, as a boy named Neville had lost one.

Neville visits their compartment to inquire if they’ve seen his frog. He later comes back with Hermione.

Before the Sorting Ceremony, Malfoy introduces his friends and makes an insult toward Ron.

Malfoy, Crabbe, and Goyle enter the compartment, insult Ron, and invite Harry to be their friend. A brief scuffle ensues, during which Scabbers bites one of them.

Ron is shorter and has an average-sized nose, while Hermione has ordinary teeth.

Ron is described as tall and lanky with a prominent nose, while Hermione is noted for her bushy hair and large front teeth.

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The Sorting Hat does not perform a song.

The Sorting Hat performs a song.

The first years are called up in a random sequence.

The first years are summoned for sorting in alphabetical order.

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Snape continues to quiz Harry, who doesn’t know the answers and stays mostly silent.

While Snape is quizzing Harry and Hermione keeps raising her hand, he sarcastically suggests asking Hermione, since she appears to know the answers.

The scene concludes following Snape's attempt to embarrass Harry.

Snape keeps deducting points from Gryffindor for trivial reasons, such as taking points off for Harry not warning Neville to avoid putting a specific ingredient in his cauldron.

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During Flying Class, Ron gets struck in the face by his broom.

This never occurs.

McGonagall approaches Harry calmly after watching him fly.

McGonagall is upset with Harry after witnessing his flying. Ron and one of the Patil twins step in to defend him.

McGonagall brings Harry to Oliver Wood, who is currently in Defense Against the Dark Arts class. They discuss Harry becoming a seeker in the hallway.

McGonagall takes Harry to find Oliver Wood in Charms class. They discuss Harry's new role as a seeker in the classroom, where they encounter Peeves.

Harry discovers that his father was once a seeker when Hermione spots his name on a trophy.

McGonagall informs Harry that his father was a seeker.

The duel doesn't occur in the book. Instead, Harry, Ron, and Hermione stumble upon Fluffy when the staircase shifts unexpectedly. They end up on the third floor and come close to being caught by Filch.

Malfoy challenges Harry to a duel, so Harry and Ron sneak out. Hermione follows to stop them. They encounter Neville outside the common room because he forgot the password. With the Fat Lady missing, they can't get back in. Malfoy has alerted Filch, and they're almost caught. They end up running into Fluffy while searching for a hiding spot.

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Harry gets the broom after the Troll attack, but there is no accompanying message.

Harry receives the Nimbus 2000 with a note and begins his training, which happens before the Troll attack.

Ron suspects that someone is pulling a prank while the Troll is on the loose.

Ron believes that Peeves might have been the one who let the Troll in.

Harry and Ron rush into the girls' bathroom to rescue Hermione.

Unaware that the Troll has entered the girls' bathroom, Harry and Ron accidentally lock it in with Hermione and must rush back to rescue her.

Seamus Finnigan accidentally blows up a feather and his drink.

In the books, Seamus Finnigan doesn’t blow things up.

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When the teachers arrive in the girls' bathroom, Harry notices Snape's injured leg.

Snape takes Harry’s Quidditch Through the Ages book. When Harry tries to retrieve it, he sees Snape bandaging his injured leg.

Hermione sets Snape’s robes on fire, and while trying to put out the flames, Snape accidentally knocks over Quirrell.

While rushing to the teacher’s stand to set Snape’s robes on fire, Hermione accidentally knocks over Quirrell.

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This doesn’t occur.

Fred and George enchant snowballs to track Quirrell and hit him on the back of the head.

For Christmas, Harry receives a sweater from Ron’s mom and an Invisibility Cloak.

Harry gets the cloak and sweater along with a wooden flute from Hagrid, Chocolate Frogs from Hermione, and a fifty pence piece from his aunt and uncle.

Ron instantly identifies the cloak as an Invisibility Cloak.

Ron doesn’t know what the cloak is.

In the Mirror of Erised, Harry sees his parents.

In the mirror, Harry sees his parents and grandparents.

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This doesn’t appear in the movie.

Snape referees a Gryffindor-Hufflepuff match, causing concern for the trio as they think he might have tried to jinx Harry’s broom.

While hiding under his cloak and trying to leave the restricted section, Harry overhears an argument between Snape and Quirrell.

After the match, Harry sees a hooded figure run into the Forbidden Forest and follows them on his broom. He overhears an argument between Snape and Quirrell.

This does not occur.

During the match, Ron and Neville end up in a fistfight with Draco, Crabbe, and Goyle.

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Hagrid says that Norbert was taken and sent to Romania.

The trio helps send Norbert to Ron’s brother, Charlie, who works with dragons in Romania.

Draco spots Harry, Ron, and Hermione at Hagrid's, leading to them all receiving detention.

Harry and Hermione sneak the dragon up to the top of the Astronomy Tower. They leave the cloak behind and are caught by Filch. Neville also gets caught because he was trying to warn them that Malfoy, who was also apprehended, had seen them at Hagrid’s Hut.

Neville does not get detention since he is not a part of what took place.

Ron is recovering in the Hospital Wing after being bitten by Norbert, therefore he isn’t with Harry and Hermione to get detention. Since Neville got caught, he also gets detention.

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No one responds to Harry and his friends losing so many house points.

Other Gryffindors begin to dislike Harry and his friends for frequently getting into trouble, causing their house to lose points.

During detention, Harry is accompanied by Malfoy and Fang.

During detention, Harry is initially paired with Hagrid and Hermione, while Malfoy and Neville are paired together. They later switch.

Only one centaur, Firenze, who saves Harry, is introduced.

Two additional centaurs, Ronan and Bane, are introduced.

The others find Harry speaking with Firenze after they saw Voldemort.

Firenze brings Harry to Hagrid and the others.

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No such incident occurs.

While under the Invisibility Cloak, Harry nearly gets caught by Peeves. He pretends to be the Bloody Baron, whom Peeves is afraid of.

There is a harp in the room that is already playing.

The trio uses the flute Harry received for Christmas to put Fluffy to sleep.

When the trio falls into the Devil’s Snare, Hermione stays calm and manages to escape. She advises Harry and Ron to do the same, but Ron remains panicked. Hermione uses Lumos Solem to drive away the plant and free him.

When the trio falls into the Devil’s Snare, Hermione climbs onto the wall to avoid the plant. She starts to panic, but Ron helps calm her down. She then uses Bluebell Flames to drive the plant away.

Harry is the only one who mounts a broom and chases the keys.

All three of them mount brooms to chase the keys.

The chess pieces knock each other out.

The chess pieces knock each other out and drag the defeated pieces off the edge of the chessboard.

After the chess match, Hermione stays with Ron, while Harry proceeds alone to confront Quirrell.

In the book, there are two additional obstacles: Quirrell’s mountain troll, which is already unconscious when the trio discovers it, and Snape’s Potion Puzzle. After the chess match, Hermione continues with Harry and helps him solve the puzzle, providing him with the potion needed to proceed.

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Quirrell snaps his fingers and creates a wall of fire to block Harry's path.

Quirrell snaps his fingers, causing ropes to coil around Harry.

Harry defeats Quirrell by touching him, which causes Quirrell to disintegrate into dust.

Harry’s touch causes blisters to form on Quirrell’s body. Quirrell dies when Voldemort leaves his body.

Harry reunites with his friends on the stairs.

Harry is reunited with his friends in the Hospital Wing.

At the train station, Hagrid gives Harry a photo album containing pictures of his parents.

In the Hospital Wing, Hagrid gives Harry a photo album of his parents.

The movie concludes with the train departing from the platform.

Harry meets his Uncle Vernon and the rest of his family at King’s Cross.