Producer and director Richard Lester is said to have been depressed that many of the outdoor locations were found so quickly, and needed so little modification.
The cast is listed in the credits in order of height.
The words "bomb" and "war" are very rarely said in the dialogue. Instead, with quintessentially English euphemism, the terms "misunderstanding", "unfortunate incident", et cetera, are used.
Last movie released by United Artist's foreign movie division Lopert Pictures Corporation, which went out of business in 1970.