Although the title inspired Burt Bacharach and Hal David's same-named hit song for Jack Jones the same year, the tune is never heard in the movie either as a vocal or instrumental.
Shirley MacLaine got into legal battle with Paramount when she refused to play part ultimately given to Janet Leigh.
When little 'Julie Austin' asks 'Wylie Driberg,' "How old are you," he says, "36 1/8." Ray Walston, who is playing 'Wylie,' is actually 49 years old at the time of the release of this 1963 film.
Bill's daughter, Julie (Claire Wilcox), doesn't like different foods to touch on her plate. This fear is called brumotactillophobia. It's a mild form of obsessive-compulsive disorder (OCD).