Director Irving Lerner met Verna Fields on the set of Spartacus (1960) where he was putting in uncredited time as a sound editor. Lerner had been signed to direct the B movie Studs Lonigan and invited Verna Fields to become the film's editor. An established sound editor, this was her first time cutting film.
It has been claimed that the screenplay was actually written by the blacklisted writer Bernard Gordon, with Philip Yordan fronting for him; this also happened a couple of years later on "The Day Of The Triffids".
Frank Gorshin and Jack Nicholson went on to play two Batman foes. Gorshin played The Riddler in Batman: The Movie (1966), and Nicholson played The Joker in Batman (1989).
Final film of Rita Duncan.