Because producer Dick Randall was simultaneously making kung-fu films in Rome, a cameo for a Bruce Lee imitator, Bruce Le, was written into this film, even though this scene makes no sense in the context of the rest of the film.
Most of the guts and gore were actually internal organs of dead animals, with real blood taken from a slaughterhouse.
(at around 1h 1 min) A pig carcass was used for the close-up of the chain saw cutting through the tennis player.
In the only trailer released, one of the final shots shows the chainsaw killer approaching the camera. As this happens, the same scream from Janet Leigh, the scene in Alfred Hitchcock's Psycho (1960) when she gets killed in the shower scene, is used.
Filming commenced in the winter of 1981. The pool scene had the actress swim in freezing cold water, and she almost froze to death as a result.
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