All the fly traps have been made by the director, Walerian Borowczyk himself.
Banned in Spain until the death of General Franco and in Poland until the fall of communist regime.
Inspired John Goto (a British photographic artist) to change his surname.
Borowczyk was dissatisfied about the color of one pair of doors on the set and (despite the fact that the film was shot in black and white) painted them himself. The technician were furious at him because he used the brush for fabric to paint the door.