Corrected entry: In the scene where the first years are sorted and Draco gets sorted into Slytherin, Ron says to Harry "There isn't a witch or wizard that went bad that wasn't in Slytherin." This statement is actually incorrect. Sirius Black, although actually innocent, was in Gryffindor when he was at school, as was Peter Pettigrew, an actual Voldemort follower.
Corrected entry: In the beginning of the movie when the students are first sorted, a little red-headed girl is sorted into Hufflepuff house before Harry. Later in the movie, she is seated at dinner at the same table as Harry, meaning she would have to be in his house, which is Gryffindor. How did she switch houses? (00:44:05 - 02:17:50)
Corrected entry: During the troll scene, there is a row of hooks in the bathroom. An item (towel or shirt) is hanging on one of the hooks behind Ron as the troll tries to hit Harry with his club and Harry says, "Do something." We next see Ron looking around. Before Ron says, "What," the item on the hook disappears. The item reappears before Ron casts his "wingardium Leviosa" spell. (01:11:13)
Corrected entry: In their first flying lesson they are all lined up standing next to their brooms and when the teacher walks to the end of the line, the camera cuts to her feet walking. The brooms have somehow disappeared on the side closest to the camera in this shot. (00:56:55)
Corrected entry: In the scene where Harry and Ron have just rushed into McGonagall's classroom, she transfigures from a cat on her desk to herself, walking towards them. In the first shot, we see the left side of her face, and she is not wearing glasses. When the shot changes so that she's facing Harry and Ron and we see the right side of her face, her glasses have appeared out of nowhere. (00:50:55)
Corrected entry: When four owls are perched on top of Uncle Vernon's car towards the beginning of the film, you can see that one on the left is obviously a painted set prop. (00:10:05)
Corrected entry: In the shot where Hagrid says something like "Quiet Dursely, yeh old prune", he bends the rifle up and Uncle Vernon shoots it. Less than a second before the gun is fired, you will notice that the hole in the ceiling is pulled slightly early(less than a second), before the gunshot. (00:13:40)
Corrected entry: When Dudley tries to get out of the snake exhibit, he reaches straight out in front of him and is surprised to touch glass. If he did not know the glass was there, he should have been reaching down to the railing to climb out not straight ahead at nothing. (00:07:45)