After leaving the drive-in circuit in the early 1970s, this movie fell into the public domain. It remained obscure until the mid-1980s, when it appeared on Elvira's Movie Macabre (1981). Afterward, it began developing a cult following that grew with its eventual release on home video.
The first movie to be released by Cannon Releasing Corp.
John Carradine never utters a word in the film. His character's "croaking" noises were dubbed in during post-production.
The house used for the Butler Mansion still stands in Oyster Bay, Long Island, NY.
James Patterson ("Jeffery Butler") died of cancer several months after production was complete. His lines were dubbed by another actor.