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.
The hallucination sequences include footage shot on location in Japan for House of Bamboo (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).)
Working titles: "Straightjacket" and "The Long Corridor"