Trivia

This was the final directing project by Robert Sparr. His film was released posthumously. He died in a plane crash on 28 August 1969 while scouting locations for Barquero (1970).

Diana is using a Panasonic model NV-8100 reel-to-reel videotape recorder, introduced in 1968.

A loose remake of Strangers on a Train (1951).

The Calabassas Country Club seen in this film is on the site of the former Warner Bros. Ranch which the studio sold in 1959. Each hole on the golf course is named after a film shot there.

Debuted in New York City on a double bill with Frankenstein Must Be Destroyed (1969).