Corrected entry: When Harry came back down from when he caught Neville's Remembrall, all the other students cheered and ran towards him. Wouldn't half the students stay back and look mad, since half of them are Slytherin? (00:56:35)
Corrected entry: When everyone is at the end-of-term feast, Harry has a cast on his wrist, but couldn't Madam Pomfrey (the nurse) have fixed it with magic?
Correction: As witnessed in "Chamber of Secrets" (and in the books), Madame Pomfrey can't just wave a wand and heal serious injuries; she can accelerate the healing process with magic, but it still takes some time.
Actually, Madame Pomfrey herself says "I can mend bones in a heartbeat" (in CoS). It is regrowing bones that is difficult and takes time. Assuming Harry's bones weren't removed in his struggle with Quirrell, the injury would have been fairly simple for Madame Pomfrey to fix. And if Snape can mend Malfoy after Dark magic is used in HBP, surely Madame Pomfrey can fix a cut on Harry's arm.
Corrected entry: When Harry, Ron, and Hermione are hiding from Filch, they find Fluffy, scream, and run away. But when they are speaking of it later, Hermione says something like "Honestly, don't you two have eyes? Didn't you see what it was standing on?" But it never shows Hermione looking down at the trap door when they were face-to-face-to-face-to-face with the three-headed dog.
Correction: The scene cuts frequently therefore she could have glanced down when the camera was not focusing on her face.
Corrected entry: When Hermione is trying to figure out the Devil's snare she pulls her magic wand out of nowhere and once she uses it and wants to check if Ron is OK the magic wand disappears.
Correction: She pulled it out of her skirt and put it back in the process of kneeling.
Corrected entry: 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.
Correction: It's not the same window - there's no outside view of it, so we can't be sure how high it is.
Corrected entry: In the first scene Professor McGonagall's broach disappears and reappears several times.
Correction: This may be explained by the fact that she is wearing a cape over her shoulders. As she moves her head, the broach becomes less (or more) visible
Corrected entry: Hagrid appears at the hut on the rock to fetch Harry on Harry's 11th birthday, which is July 31. The next day they go to London to buy Harry's school supplies, then end the day at King's Cross. But the letter Hagrid hands Harry at the hut (in the book, anyway - and in the film if you stop it to read what Harry doesn't) tells him to report to the train on September 1. What happened to the month of August?
Correction: It is never specified when is Harry's birthday This is a film/book discrepancy.
Corrected entry: In all the shots of Snape that show the area around his feet, his cloak is either dragging on the floor behind him or gathered about his feet showing that it is quite long. However, after he wishes Harry luck in the Quiddich game against Slytherin, when he walks away the cloak is short enough in the back so Harry can see his limp from being bitten by Fluffy.
Correction: He could have had more than one cloak. So when he got the injury on his leg, the other cloak could have gotten ripped so it needed repairing. That meant that he had to wear a different cloak until his other one got mended.
Corrected entry: When Harry visits Gringotts, and is seen at vault 713 he is carrying 3 bags (presumably money he has just taken from his own vault). When he has picked up some supplies, and is just about to go to Olivander's, he and Hagrid are only carrying boxes. (00:23:25)
Correction: Maybe Hagrid was carrying them in his coat, or maybe they had spent almost all the money, so they didn't need to carry the bags.
Corrected entry: 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.
Correction: It took a close look to resolve this one. The room's laid out such that the door is between the outer wall and a shorter inner wall - Harry has to run around it to get to the mirror. As such, when we see the room it looks like the door's disappeared, whereas actually it's just behind a short wall.
Corrected entry: 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.
Corrected entry: When Hagrid show Harry, Hedwig (the owl) If you look at Harry's forehead you can see that his scar isn't there. If you look in the previous scene, when Mr. Olivander tells Harry about his wand, his scar is right above his eyebrow, but in the next scene his scar isn't there.
Correction: If you look close enough, you can tell the scar is still there, and that it just kind of faded out a bit. It is still there, though.
Corrected entry: After Harry, Ron and Hermonie have completed the chess game challenge, Harry instructs the other two to "go back and get help". So, are they just supposed to waltz back through the previous challenges, somehow climb up through that Devil's Snare, and out the trapdoor guarded by Fluffy, who is very awake now (and hopefully not standing on the door)?
Corrected entry: During the Quidditch match, someone falls from their broomstick, landing in a pile of sand. But when we first saw the pitch it was all neat grass - where did the sand come from?
Correction: There's sand visible under the goalposts in the first shot of the field.
Corrected entry: In the scene on the rock in the middle of nowhere, Harry is reading the letter from Hogwarts and Uncle Vernon tells Harry, 'You'll not be going there, Daniel.' (00:15:58)
Corrected entry: 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.
Corrected entry: In the scene of the sea hut, how could the gun have been shot if Hagrid had bent it?
Correction: The gun is a shotgun. Since shot consists of small pellets they could have easily passed through the bend.
Corrected entry: At the end of the movie, when the train is leaving Hogwarts, where is the big lake that they crossed in boats in the beginning of the movie? If you look at Hogwarts there is clearly no lake around it.
Correction: There's no lake around the castle - it's on the south side. First years just cross the lake because it's tradition.
Corrected entry: When the Slytherins and Gryffindors have their first flying lesson, there is a girl wearing another house's uniform. <
Correction: It isn't specified in the movie that only Slytherins and Gryffindors are in this class. This is more of a movie/book discrepancy.
Corrected entry: How come Hermione is so confident that she'll get into Gryffindor? On the Hogwarts Express Train, she is already wearing a Gryffindor tie (red and yellow) before arriving at Hogwarts or being sorted into houses.
Correction: She is wearing a black tie with Hogwarts' crest.
Correction: Not all the students in Slytherin hate Harry