Continuity mistake: In the opening sequence, Felix (Jack Lemmon) goes into the Metropole Cafe. One of the people he passes as he enters is a young woman with a thin face and very distinctive nose and eyes. He goes in, has a drink, hurts his neck, and leaves. As he is leaving, the camera pans the band and go-go dancers. One of the dancers is the young woman who had just left as he was entering.
Continuity mistake: When Thorndyke is squirting oil at Havershaw in the garage towards the end of the movie, the amount of oil on Thorndyke's right shoulder changes between shots.