The TV show that Harrington refers to in an attempt to fool Inspector Russell is a clip from Mario Bava's own Black Sabbath (1963) - specifically the "Wurdalak" sequence featuring Boris Karloff.
Originally the script didn't include the character of Mildred Harrington. It was only after Laura Betti expressed interest in working with Bava that the director re-wrote the script so that Betti could have a suitable starring role.
The Spanish villa that the majority of the film was shot at was formerly the home of Spanish dictator Generalissimo Francisco Franco.
The Harrington's bed was originally used as a set piece in an earlier Bava film, 1963's Black Sabbath (1963).
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By what name was Hatchet for the Honeymoon (1970) officially released in India in English?
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