Harry Potter and the Philosopher's Stone

Revealing mistake: When Harry, Ron and Hermione are making their way back to the Gryffindor common room, Ron says 'She knows more about you than you do', to which Harry replies 'Who doesn't?' The "solid brick" staircase moves so that they have no place to go but the third floor forbidden corridor. If you pay attention to the staircase it can be seen that there is a good gap between the staircase and the one it connects to when it moves and that when Harry, Ron and Hermione run off the staircase to the corridor the staircase made of "solid stone" does an awful lot of shaking. (00:58:40)

Other mistake: Percy Weasley is obviously talking to the Gryffindor first years when they first enter the Gryffindor common room, but there are too many first years. There are 5 boys and 5 girls in each dormitory, so 10 first years in each house, but in the shot there are obviously almost 20 students there, not including Percy. (00:47:30)

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Suggested correction: While each room does only fit 5 students at a time, the movie did not state there is only one room for each gender per year. We don't see all of Gryffindor tower and have no way of knowing if there is only one room for first year boys/girls.

Draco Malfoy: Think my name's funny, do you? No need to ask yours. Red hair... And a hand-me-down robe. You must be a Weasley.

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Trivia: When Neville receives a Remembrall from his grandmother, it glows red to inform him that he forgot something. Neville says that he can't remember what he forgot. If you look closely, Neville is one of very few students not wearing his robe. He most likely forgot to put his robe on.

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Question: I noticed that Harry's scar hurts when he comes close to Professor Quirrell, but why is this not happening when he meets him for the first time in Diagon Alley? Wasn't Voldemort on his head yet?

Loesjuh1985

Chosen answer: Voldemort is not on his head in Diagon Alley as explained in the books. He attaches himself to Quirrell when he learns that Quirrell was unsuccessful in getting the Philosopher's Stone from the vault, in attempt to keep an eye on him.

But in the movie when they met in Diagon Alley, Quirrel refused a handshake because it would kill him.

It's never explained in the movie that that is why he doesn't shake hands. In the books, hagrid says that Quirrel hasn't been right since he met a few vampires in the black forest.

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