Audio problem: When the CT technician asks John if he'd like some help getting down, John says "Thank you very much", but you can tell that he's not saying anything and that the line is just dubbed in. (True, the camera is facing away from him, but his jaw and face aren't moving at all.)
Audio problem: When Jason dies, he says the line, "But we have to finish the movie." If you pay attention, his mouth isn't moving for the word "but."