Corrected entry: Dudley is supposed to fall into the water in the Reptile House, which is obviously the one at London Zoo, yet he arrives back at his home in Surrey still shivering and wet. He would surely have dried out a bit on the journey home?
Corrected entry: This must always be a risk when working with child actors and filming out of sequence, but Daniel Radcliffe's voice obviously started to break during filming. It was most noticeable during the scene in the forest when his voice went from high to low to high again (and again, and again...)
Corrected entry: During the final chess game when the Queen is moving into position to smash Rons knight, they cut back and forth from the Queen to Ron. During one cut, the queen figure has its fingers laced and sticking out; in the next shot, one hand is a fist being covered by the other hand. Then it cuts back to outstretched laced fingers again.
Corrected entry: When Quirrell reports that there is a troll in the dungeon then faints he is laying one direction, but a few seconds later from a different shot he is laying the opposite direction.
Corrected entry: In the sorting ceremony, we see Susan Bones, the girl with long curly hair, was sorted into Hufflepuff House. Later, in Professor Snape's Potion class, we see Susan was sitting behind Harry when Snape questions him. Only Gryffindor and Slytherin are attending in that class together - Susan was in the wrong class!
Corrected entry: 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!
Corrected entry: 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.