ट्रिविया

Uses the same "library" set featured in ...E tu vivrai nel terrore! L'aldilà (1981).

Filmed on the Ellis Estate in Scituate, MA where another Italian horror film, La casa 3 (1988), was filmed.

One of the early VHS issues of this film in America had several of the film's reels out of order, further confusing the already erratic story.

Third part of Lucio Fulci's "Gates of Hell" Trilogy. The other two films include: Paura nella città dei morti viventi (1980) and ...E tu vivrai nel terrore! L'aldilà (1981).

The film's original shooting title was "Freudstein."

Lucio Fulci: As Professor Mueller, who talks with Norman Boyle on the New York City street.