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Revealing: When Mr. Kubitz arrives at the house and finds Phil with makeup on, a car is driving by in the background. A few seconds go by before the shot goes back to Mr. Kubitz - plenty of time for the car to have driven out of shot. But when Mr. Kubitz is shown at the doorway again, the car is still there, driving along.
Continuity: When Charlie and his son are sitting at the table having breakfast, Charlie puts his fist to the side of his face, and his son copies. In the shot of both of them, his son's hand isn't a complete fist, he still has his fingers pointing out, but in the next shot of just him, his hand is a complete fist.