The original title was "The Incredibly Strange Creature: Or Why I Stopped Living and Became a Mixed-up Zombie." Columbia Pictures threatened to sue writer/director/star Ray Dennis Steckler, saying the title was too similar to its upcoming film, Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964). Steckler, amazed that Columbia would feel so threatened by a $38,000 film, phoned the studio to straighten things out. He made no progress until he demanded that Stanley Kubrick get on the line. When Kubrick picked up, Steckler suggested the new title, Kubrick accepted, and the matter was dropped.
Ray Dennis Steckler had the dancing girls in an early scene chew gum as they danced, hoping it would distract from their bad footwork.
First film credit of László Kovács. NOTE: He and Vilmos Zsigmond later became A-list Directors of Photography.
At some screenings, theater employees and Ray Dennis Steckler himself wore monster masks and ran through the theaters to scare patrons.