Did You Know?
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.
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The "look" of the killer was based on the comic book character "The Shadow", not as is often thought Italian 'giallo' cinema.
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A pig carcass was used for the close-up of the chain saw cutting through the tennis player.
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