Corrected entry: In the library at night, Harry escapes Filch and Snape by staying hidden under his invisibility cloak, leaving the room through a door. Harry's hand either must have been visible while operating the door handle or the handle itself must have become invisible if Harry would have touched it with his hand wrapped in the cloak. But the door opens without the door handle being pushed down at all. (01:31:35)
Corrected entry: At the end of the film when Hagrid gives Harry the photo album, Harry opens it to the picture on the front. But going by what we've seen from other clips earlier on when his parents died, the picture is chronologically wrong. They died when he was a baby not a toddler, yet in the picture James and Lily are holding a toddler version of Harry.
Corrected entry: Percy Weasley is obviously talking to the Gryffindor first years when they first enter the Gryffindor common room, but there are too many first years. There are 5 boys and 5 girls in each dormitory, so 10 first years in each house, but in the shot there are obviously almost 20 students there, not including Percy. (00:47:30)
Corrected entry: Just after Draco Malfoy was sorted, Ron mentions to Harry that there wasn't a witch or wizard that went bad that wasn't in Slytherin. However, at this point, Sirius Black was believed to be a dark wizard by the whole wizarding community, and was very well known as well, although he was in Gryffindor when he was at Hogwarts.
Corrected entry: Just after Ron says, 'Mails here!', we see the owls dropping various packages to Hogwarts students. The very first owl closeup we see is a brown one and s/he is flying to the right. It's carrying a green package. When the owl drops the package and a student catches it, however, the package has turned blue. (00:53:50)
Corrected entry: In the end credits they say that there are 3 beaters on the Slytherin team. There should only be 2.
Corrected entry: Watch Neville as he falls - he crashes on his back, but when Madam Hooch comes to him, his on his stomach.
Corrected entry: Near the start, Percy says "Boys upstairs and down on your left, girls the same on your right". However, after the three heroes have been to investigate Fluffy and they go back to the dorms, when they reach the top of the stairs Hermione goes to the left and the boys head right. (00:49:30 - 01:03:30)
Corrected entry: There's no reason whatsoever the trio needed to risk telling Hagrid at nighttime that they knew about the Philosopher's Stone, as it ends up in them getting in trouble. They could have told him immediately after Hermione found out about the Philosopher's Stone in the library. Or if they couldn't find time between classes, they could have waited until tomorrow.