At the battle with the professor, the profesor was perfectly fine when he tried to strangle Harry. It's only when he was touched by Harry's hands did he start to melt. But later Dumbledore said that the power was in Harry's skin (But apparently not at the neck).

When the troll is about to swing at Harry for the third time with his club, Ron levitates his club in mid-air. When the club falls, it hits the trolls head with a loud thunk, then falls to the ground. But you never hear any sound of the club hitting the ground.

When Harry first views the golden snitch, and it begins to fly in the air, both characters are apparently watching it, but are looking in different directions.

In the scene where Harry is talking to Hermione and Ron about Hagrid's dragon, he says "Hagrid's always wanted a dragon, he told me so the first time I ever met him," but in the movie Hagrid never tells this to Harry.

When Ron, Hermione, and Harry are looking at James Potter's seeker plaque in the trophy case, a similar crest next to his says that McGonnagall was on the same Gryffindor Quidditch team - the movie leads you to believe she was pretty old. That means, by my reasoning, that she would have been AT LEAST 20 years old when she STARTED playing for the Gryffindors in the 1970s.

A plot hole about Quirrell getting through the puzzles with no lingering effects was corrected by saying that they probably reset themselves afterwards, which makes sense. However, this itself creates a mistake - if the challenges to get to the Philosopher's/Sorcerer's Stone reset themselves after each person, how is it that the winged key is injured?

More trivia than anything else, but the only major character to be cut out of the books was Peeves the poltergeist - he was due to be played by Rik Mayall (people in the US might not know him, but he's big over here - been in various TV shows and films). He filmed all of his parts, but then got cut due to an over-long running time.

Often in the film we hear owls flapping in flight, but everyone knows that the whole point is that owls fly completely silently so they can hunt efficiently at night.

Hagrid was explaining to Harry about his parents and mentioned that it was some years ago that they were at the Hogwarts, I did the calculation and it seems that they would have been 17 years old when they had Harry and you get out of Hogwarts when you are 18. I can't recall all the details though, so if someone can help out...

When the three children get past Fluffy because the harp is playing, as Fluffy wakes he dribbles on Ron's shoulder. However, when they fall down into the Devil's Snare, his jumper is completely dry.

At the start of term feast, after Harry is sorted into Gryffindor, he sits down on the right side of the table next to Ron. When the feast appears, Harry is on the other side of the table, next to Hermione.

When the troll is in the girls toilets, it looks like there's only one line of cubicles, and he smashes the top half off twice.

After the three heroes have been to investigate Fluffy and they go back to the dorms, Hermione goes to the left, when earlier on just after they were sorted the girls' dorm was said to be on the right.

In the scene in Diagon alley when Harry first enters there are some witches on the left hand side of the screen looking at what appears to be large lollypops and Harry walks past them. The camera angle changes and Harry walks past them again.

After the final confrontation Harry has scratches on his face, particularly one on his chin. When visited by Prof Dumbledore the chin scratch is barely there but in the scene in the refectory it is back and appears larger than before.

When Hermione is battling the Troll in the girls' bathroom, the Troll uses his club to smash one of the basins that Hermione is hiding under, but the next shot of Hermione under the sink shows that particular sink intact and unharmed.

In the scene when Harry, Ron, and Hermione visit Hagrid, Malfoy is visible through the window. He appears to be eye level with the window and is shown turning and running away. When the camera zooms out later in the film, the same window that Malfoy is supposedly looking through is far too high for anybody to see through without a ladder. He obviously didn't have a ladder or he would have fallen off it when he turned to run away.

When he removes the invisiblity cloak in front of the mirror, what happens to it? It's visible when he's not wearing it, but it's nowhere to be seen...

When Harry is in the potions class he is caught writing notes down, we see his neat writing in close up ... but when the camera angle changes we can see that the writing has changed in size to very large letters and quite messy writing.

When Harry first finds the mirror of Erised, he walks through the door and the mirror is on his right. This is the same when he takes Ron to see it, but when Dumbledore finds him in front of the mirror, if you look where the door should be, there is just wall.

After Harry escapes the restricted library with the cat following him, once he come across the professors the cat disappears.

In the bit where Harry, Ron and Hermione are fighting the troll, when Ron knocks the troll out it falls flat on its face - but when Harry takes his wand out of its nose, its head is facing the right-hand side.

When Harry is having problems with his broom during the Quiddich game, Hermione goes to stop the spell cursed upon it. She moves astonishingly fast to be able to get down from her place, run over to the other one, and climb up it.

When Harry, Ron, and Hermione are telling Hagrid that Snape is trying to steal the stone, he tells them that Snape helped protect the stone, and 'he's not about to steal it'. So far so good, sticks to the book. However when they actually try to save the stone, Snape's challenge, the logic one with potions, is missing!

In the scene when Harry is in the restricted section of the library he walks in in the dark with only a lantern. He puts the lantern down in front of himself and begins to read. If you look at the bookshelf, his shadow is cast on the other side of the lantern as though the light is behind him.

How come Hermione is so confindent that she'll get into Gryffindor? On the Hogwart Express Train, she is already wearing a Gryffindor tie (red and yellow) before arriving at Hogwarts or being sorted into houses.

At the end of the film when Harry recieves the photo album, the child in the photo is clearly older than 1, but his parents died when he was just 1.

How did Hermione know it was Harry Potter when on Hogwarts Express his scar was covered by his fringe?

In the chess game, what happens if a human takes another piece? The game seems to require that you smash the massive piece of stone currently occupying that square!

In the game of chess Hermione takes her position as the queen-side castle and stands on a black square, but it should be a white square.

It the begining of Harry Potter, there is a sequence when Harry's mother is being killed. When we see Harry, he is wearing a Blue's Clues romper suit - I do not recall Blue's Clues being around in 1990.

When Hermione shows Harry and Ron the trophy case, she shows Harry a plaque of James Potter it states he is a seeker, but if you have read the books you would know that JK Rowling has said that he is a chaser