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Continuity: During the scene when Jennifer gets matches on her side of the room, she lights one, presumably to see into the other room. In one shot the match is burned down almost to her finger, the next shot from the other side of the glass it is longer, and the next shot shows the match at a different angle with a larger flame than the previous shot. When she drops the match because it is supposed to have burned to her finger, it is clear the flame was not close to her finger/thumb at all.