Trivia

Robert Mitchum said he turned down the role of Pike Bishop in The Wild Bunch (1969) in order to make this film.

Robert Mitchum narrowly escaped being crushed by a falling camera during filming.

Denver Pyle was only eight years older than his screen son Roddy McDowall.

The casting of Dean Martin and Robert Mitchum produced no chemistry on screen or off. Martin stayed in his trailer all the time watching television when they were not filming, and the critics felt he had just phoned in his performance.

Robert Mitchum's character was a variation on his role in The Night of the Hunter (1955).