As for the legend of the Chamber of Secrets, Professor Binns, the history of magic teacher, told it to the students in the book, but in the movie, it was told to them by Professor McGonagall, and Professor Binns did not appear.

During the Quidditch match, Malfoy did not fall in the book, but Malfoy did in the movie!

In the Chamber of Secrets, Voldemort planned to watch Harry die from snake venom, but Fox healed his wound with tears. In the movie, Fawkes heals him after Voldemort's death.

In the end, Dobby was freed. In the book, Harry stuffed the diary into his sock and handed it to Mr. Malfoy, but in the movie, the sock was sandwiched in the diary.

Vanished Without a Trace

Main characters and events in the book that did not appear in the movie

A letter from the Ministry of Magic warning Harry about underage use of magic.

Goblin in the garden of The Burrow.

The scene where Harry sees Draco and Lucius Malfoy in Knockturn Alley appears in a deleted scene and does not appear in the main version of the film.

Peeves--still not in the movie.

The scene where Lockhart meets Professor Sprout before the first Herbology class of the year, where Lockhart implies that he knows more about caring for the Whomping Willow than Sprout does.

The scene where Lockhart lectures Harry about signing a photo (due to Colin's actual request in the book), causing Harry to be late for Herbology class.

About Ron's confinement and his recognition of Tom Riddle's name from a medal for special contributions to the school.

Nearly Headless Nick’s Death Anniversary Party.

Hermione needs permission from Lockhart to enter the restricted area of ??the library, but in the movie, Hermione finds "Powerful Potions" from the standing bookshelf.

Harry, Ron and Hermione cooperate in Potions class to obtain the ingredients for Polyjuice Potion.

Polyjuice Potion's effect on Harry's appearance and on Harry and Ron's voices were removed from the film, so they had to pretend to be Crabbe and Goyle's voices.

Valentine's Day pranks, including Lockhart's dwarf angel and the infamous "Singing Valentine" composed for Harry.

Percy's mysterious behavior and the character of Penelope Crevat (who is only mentioned by name when Nearly Headless Nick passes by).

The Weasley twins protect Harry.

Almost every foreshadowing hint about Ginny's intense or emotional actions.

An own mistake

The main plot line changes when switching to the screen

In the first Defense Against the Dark Arts class, Lockhart brought Bandon to The female ghost is said to become a male.

Gryffindor's first Quidditch practice was severely curtailed, with Oliver Wood wasting no time in lecturing the team before entering the field.

(Not that sleepy preaching)

Hermione asked about the Chamber of Secrets in Transfiguration class, not in History of Magic class. (Probably more convincing to have the Deputy Headmaster explain)

Snape's line in the Duel Club about sending a man to a hospital ward in a matchbox is no longer directed at Justin Finn The pairing of Leary and Neville, but the pairing of Harry and Ron (assuming Ron's wand is malfunctioning).

The first spell Malfoy used in the Dueling Club was changed to Everte Statum - causing the opponent to fly out and fall.

Summoning Magic

The magic added in the movie is not supported by the book

Hufflepuff (for example: Justin Finch-Fletcher and Susan Bones) and Slytherins (Malfoy, Crabbe and Goyle) with the Gryffindor students.

The Slytherins (Malfoy, Crabbe and Goyle) appeared with the Gryffindor students in the Transfiguration class. (The class is held together probably to make it look like there are more people in the class, but it also creates the illusion that all students of the same grade seem to be in class together)

In the Transfiguration class, animals were turned into water cups.

Ron brings the mouse Scabbers to the Transfiguration class (Neville sometimes brings his pet toad Rifle to class, but in the books Ron never brings Scabbers to class.

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