Plot hole: At the beginning of the movie, Hedwig rattles her cage, and Harry says apologetically, "I can't let you out, Hedwig; I'm not allowed to use magic outside of school." But he wouldn't have to use magic to let her out - the key is visible sticking out of the lock on the cage, so all he would have to do is turn the key. (00:01:10)
Plot hole: When Harry and Ron transform into Crabb and Goyle, he doesn't take off his glasses so then Malfoy can comment on them. Goyle doesn't need glasses - Harry's eyesight should've been immediately blurry, and he would have taken them off.
Suggested correction: For all we know Goyle does need glasses and either doesn't realise it or doesn't want to say it. When I was in high school for example, I used to give my glasses to students who couldn't read the board. They didn't wear glasses, but obviously should have had them if they could see better with mine. Plus it is shown from the film the potion Hermione made doesn't change things like internal voice boxes. It's reasonable to conclude it didn't work for eyesight either.
