Paul Birch walked off the film before shooting was completed after having a physical confrontation with Roger Corman. He was quoted as saying, " I am an actor, and I don't need this stuff... To hell with it all! Goodbye!" According to co-star Beverly Garland, Birch objected to the fast pace of the film, the old-fashioned, uncomfortable hard plastic contacts he had to wear, and the film's low-budget, which he considered beneath his status. As a result, Birch's remaining scenes were shot with Lyle Latell doubling for Birch.
Joe Piper was written as a brush salesman in an earlier draft of the script. Moreover, Dick Miller ad-libbed all his dialogue as Piper and came up with the idea to make Piper a vacuum cleaner salesman.
Allied Artists Pictures released this film on a double bill with Attack of the Crab Monsters (1957) with the tag line "Terrorama! Double Horror Sensation!"
According to star Beverly Garland, both interiors and exteriors were filmed in a beautiful old Tudor-style house in Hollywood with a swimming pool.
One of the bums is played by Hank Mann, one of the original Keystone Kops. At the time he made this, his career had spanned about 45 years and many shorts and features..
This was the final theatrical feature film to be shot by veteran director of photography John J. Mescall, ending a career of about 35 years going back to the silent days.
This film fell into the public domain because the release print did not include the copyright year.
One of the distribution prints repeated three scenes to lengthen the film. These three are: the scene in which Johnson speaks with the courier in his living room (first appearing before the opening credits as a flash-forward), the scene in which Johnson chases Nadine (repeated immediately) and the scene in which Harry chases Johnson (repeated immediately).