Continuity mistake: Roy climbs out the window and walks along the edge, to try to get his daughter out of the bathroom. It starts to rain so his wife puts her head out the window to try and see her husband and gets soaked from the rain. Her was wet, her "hat" was wet and floppy, but after a few minutes, there is no trace of the rain; she is completely dry. And then, suddenly, she's wet again, right to the end.
Continuity mistake: During the wedding sequence when Walter Matthau is trying to force his daughter Mimsy out of the bathroom his vest is closed with his tie inside. The next second the vest is open. Then it switches back to being closed again.
