Corrected entry: In Transfiguration class when professor McGonagall is explaining the lesson you can see that the instructions are mirrored on the blackboard. (00:54:18)
Corrected entry: If Voldemort can possess a person who is writing or having his old diary, as he did it with Ginny, I'm asking myself why didn't he just possess Harry the same way, as Harry is also writing in it. I mean, if he could control actions of Harry Potter, his biggest enemy, it would be a perfect goal for Voldemort. Voldemort is very smart and he wouldn't miss that, so it's unexplainable how Harry didn't fall into the possession of Tom Riddle.
Corrected entry: In the scene when Harry first comes to the burrow, there is a shot where Harry is examining the clock. It has Mr. Weasley at quittich, but later on he comes home from work. Also, it says Mrs. Weasley and Ginny are in the garden, but later on Ginny comes down from upstairs. Persy is said to be in the garden. (00:11:15)
Corrected entry: In the beginning of the movie, Harry and Dobby are fighting over the lamp when Harry hears Vernon knock at his door. Do you really think that Vernon, really mad and annoyed at Harry, would patiently wait at the door while Harry got the lamp from Dobby and pushed him into the closet, to come in and threaten Harry?
Corrected entry: Harry and Ron are in the corridor reading the wad of paper they found on Hermione, but instead of reading a huge advantage point, 'The crow of the rooster can kill the basilisk' they only focus on the part about spiders running away from it, which they already knew, and enter the chamber rooster-less.
Corrected entry: Ginny found Riddle's diary and she started writing in it, and slowly became possessed by him as the memory in the diary, and started writing messages on the wall, opened the chamber, etc. But at some point, she realized that she was doing wrong things and threw the diary in the bathroom, and Harry found it a few days later. But if she didn't possess the diary anymore, she wouldn't be possessed by Voldemort anymore, so it's a big mistake that she smashed the Gryffindor dorm room to find the diary. Why would she try to find something that she was trying to get rid of? Riddle couldn't order her to do it because he possessed her through the diary, and she didn't write in it or even have it any more.
Corrected entry: During the Herbology lesson with the mandrakes, Professor Sprout issues the class earmuffs, obviously to block out the screams that would follow. In order to do so, the earmuffs must block out all sound entirely, lest they all pass out, assuming the slightest sound from the mandrake causes ill effects. The plot hole is with the earmuffs. When the first mandrake is pulled, the rest of the class quickly press their earmuffs tightly over their ears. This action (and their faces) show they can hear the screams to an uncomfortable level. A moment later, Neville faints but more or less out of fright. Sprout states afterward that he's neglected his earmuffs, Seamus then replies that he's just fainted. Seamus heard what Sprout had said, given he had the earmuffs on and the distance between he and the teacher. They all should have fainted after Sprout pulled the first mandrake (this can also be said for after they all pulled up some 10 or so afterwards) as they could all hear the cry through their earmuffs.
Corrected entry: When Harry arrives at the Weasley's we see the clock that shows where everyone is. We see the twins' and Ron's picture moving to show they're home, but no-one else's picture is in the same place. Shortly afterwards we see that everyone else is already home, except Mr. Weasley. (00:11:15)
Corrected entry: In the shot when Dobby is punishing himself after agreeing with Harry about not meeting many decent wizards, Dobby begins hitting his head against Harry's drawers. You can see in the upper left corner a piece of clothing hanging out, and in the lower right corner a green piece of clothing. In the next shot, the green clothing is gone, but reappears again in the following shot. (00:04:15)
Corrected entry: The actress who played Gryffindor chaser Alicia Spinnet in the first Harry Potter movie (Leilah Sutherland) isn't the same actress in the second movie. She was played by Rochelle Douglas as indicated in the ending credits. If you pay attention and look closely, you'll be able to spot some differences in appearance.