Trivia: After Karen takes Michael's mask, if you listen closely, Michael says to her, "Give it back."
Suggested 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.