Harry actually got his own room after the letters read the cupboard under the stairs
When Harry and Hagrid went to Diagon Alley Harry actually meet Draco while they were both being fitted for their school robes.
Harry is not taken to Kings Cross by Hagrid, but his Uncle a few days after meeting Hagrid.
Nicholas flamel was first mentioned in the book on the back of Dumbledore's Chocolate Frog Card not in a book.
In the book there is a fourth challenge that is a potions challenge that has cups on has a potion that could kill on lets them through the flames to the next room, one lets them back to the other room, and the other one kills you.
the Chamber of Secrets
The heir of Slytherin message is written in blood in the movie, but in the book it is written in paint.
It is never mentioned in the movie that Mr.Filch is a squib and cannot do magic.
When Harry is broken out of his house Fred and George have to sneak into the house to get his things from the cupboard in the book, but in the movie Harry has it in his room.
The Death party of Nearly Headless Nick that happens in the book is not even mentioned in the movies.
the Prisoner of Azkaban
When Harry takes the Knight Bus he pretends to be Neville Longbottom.
In the book after Sirius breaks into Hogwarts the Fat Lady is replaced by Sir Cadogan's portrait.
In the book Harry wins the Quidditch Cup, but it is never mentioned in the movie.
In the movie the story of the Marauders is not mentioned, and you do not learn that James Potter, Sirius Black, and Peter Pettigrew were illegal annimagus to give their friend Remus company while he transformed every month.
In the book Harry is sent a Firebolt that gets confiscated by McGonagall because it could be curesed, but in the movie he doesn't receive the broom until the end of the movie.
the Goblet of Fire
Percy Weasley in the book gets a job at the Ministry, and betrays his family which is left out of the film.
When Harry's name is pulled from the cup in the book Dumbledore is way more calm than in the movie
In the book Rita Skeeter is an unregistered animagus, and transforms herself into a beetle which is how she know so many private things.
In the books Hermione creates SPEW the Society for the Promotion of Elfish Welfare, and the house elf Winky is completely omitted from the movie.
In the book Dobby is the one that gives Harry the Gillyweed, but in the movie it si Neville that gives it to him.
Harry gave his winnings from the Triwizard Tournament to the Weasley twins to start their business, but in the movie there is no mention of him receiving any winnings.
the Order of the Phoenix
There is no mention of Quidditch in the movie at all or the fact that Harry, Fred, and George were banned from playing and Ginny takes his places as seeker in the book.
The film does not show the extent of the marauders torture of him that is mentioned in the book.
In the film Cho Chang is said to have told about the Dumbledore's Army, but in the book it is actually Marietta Edgecombe.
In the book Harry and Cho go on a date, but they just kiss in the movie.
Hermione and Ron are named prefects in the book, but not in the movie.
In the book it is mentioned that Professor Trelawney's prophecy could have been Neville, but Voldemort chose Harry.
the Half-Blood Prince
In the book Harry inherited Grimmauld Place, but it was not mentioned in the movies.
Bill and Fluer were living in the Burrow while planning the wedding in the book, and Fluer did not get along with Molly or Ginny.
In the film Luna finds Harry on the train after Draco stomps on him, but Tonks finds him in the book.
The story of Voldemort's family -The Gaunt's- was left out of the film.
The attack on the Burrow that happens in the movie does not actually happen in the book.
It is never mentioned that Fenir Greyback is the werewolf that turned Lupin in the movie.
In the book Harry and Ginny's first kiss happen in front of the whole school instead of in the Room of Requirements where it happens in the movie.
In the book Bill is bit by Fenir Greyback, but it is not mentioned in the movie.
Ginny and Harry in the book have an actual relationship throughout the book and break up for her saftey. Their is not mention of their relationship in the movie.
the Deathly Hallows
In the book Dudley thanks Harry for saving his life, but it is deleted from the movie.
At the wedding Harry is disguised as a distant red headed cousin Barry Weasley.
The dance scene that happens in the movie does not happen in the book.
Peter Pettigrew dies in the book after he is compelled to strangle himself with the hand Voldemort gifted him.
In the book its Harry's idea to release the dragon not Hermione's.
The back story of Dumbledore is less detailed in the movie than in the book.
In the book Ron makes a ghoul that looks like himself to protect his family, and give a reason as to why he is not at Hogwarts.
Ron and Hermione's first kiss in the book is in front of Harry after they destroyed the Horcrux.
Harry does not break the Elder wand he fixes his wand and the puts it back with Dumbledore in the book as opposed to him breaking the wand in the movie.