Corrected entry: After Karen takes Michael's mask, if you listen closely, Michael says to her, "Give it back."
Corrected entry: When Lonnie gets scared of Michael, he says he's sorry for tripping Tommy Doyle when it was Richie who tripped Tommy in the original film.
Correction: This is hardly a mistake. He was part of the group that was picking on Tommy and tripped/pushed him, regardless of whether he was specifically the one who physically did it, and was panicking and confessing. Similar to how, if you're with a group of friends and someone steals something, you might say, "I'm sorry we stole something." You're part of the group.
Correction: This is just an out of control fan-theory and has absolutely no confirmation anywhere, and it honestly sounds more like a mixture of Allison crying and the ambient noise of the scene than a male voice speaking or whispering. Unless the director comes right out and confirms that they very quietly looped in Michael speaking (which he hasn't), it's not something that should be listed as confirmed trivia.
TedStixon