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.
Corrected entry: When the Slytherins and Gryffindors have their first flying lesson, there is a girl wearing another house's uniform. <
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: 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?
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: 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 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.
Corrected entry: When Ron is playing chess on top of the knight, why does he not just get off it when the other side's piece comes to destroy it? I could not understand why he clung on. It took an age for the other piece to arrive to destroy his knight, he had all the time in the world!
Corrected entry: In the scene where the troll has just gone into the girls washroom, Hermoine quickly goes back in to the 1st stall on the right hand side, but when you see the above view she is in the 3rd from the right. (01:07:23)