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.