Quiz

Because of the film's budget and the size of the sound stage, Samuel Fuller hired little people to walk around in the far section of the corridor to give audiences a greater sense of depth.

According to Samuel Fuller, the film was shot in 10 days, on one set, with no exteriors.

The hallucination sequences include footage shot on location in Japan for La casa di bambù (1955) and footage shot by Samuel Fuller in Mato Grosso, Brazil, for the unfinished film Tigrero (see Tigrero: A Film That Was Never Made (1994).)

Samuel Fuller was not happy that Allied Artists marketed this film as an exploitation picture.

Working titles: "Straightjacket" and "The Long Corridor"