According to Samuel Fuller, the film was shot in 10 days, on one set, with no exteriors.
Both this and Samuel Fuller's following movie The Naked Kiss were rejected for UK cinema certificates and remained unavailable until 1990.
Early in the film, during the strip club scenes, a photograph of Samuel Fuller (famously with a cigar) can be seen on the wall.
In the initial scene in the psychiatrist's office, Dr. Fong has on his wall portraits of Sigmund Freud and Carl Jung.
The hallucination sequences include footage shot on location in Japan for House of Bamboo, and footage shot by Samuel Fuller in Mato Grosso, Brazil for the unfinished film Tigrero (see Tigrero: A Film That Was Never Made.)
This film was selected to the National Film Registry, Library of Congress, in 1996.