Audio problem: When Gilliam slams on the brakes, the tires make a screeching sound, but the wheels come rolling to a stop, ergo do not skid. (00:56:50)
Audio problem: The second time Jeffrey visits his father in hospital, there's the whooshing sound of a respirator, but the father isn't on a respirator and he's in a single room, so there's no need for a respirator, or the noise of one.
Audio problem: In the scene after Norman goes for a late-night swim, when he's telling Maureen that he slipped in the mud, you can see that his mouth never moves, yet he speaks the words "I slipped in the mud."