- The British version is the Director's version of the movie. There was also a "continental version," which included nudity and more violent murder shots. According to the director's commentary on the Bluray, this was done for purely financial reasons, to get distribution in places that would otherwise be uninterested in it. The continental version ran 88 minutes, includes: a changing room scene with several girls having their breasts exposed; Maggie (Dorinda Stevens) and Hazel (Jane Taylor) join two gentlemen in a private room, then one of these pours champagne over Maggie's chest, and as he kisses the champagne off her chest, her dress is pulled down to expose a breast; Hazel is accosted by the Ripper in an alleyway, her breast is shown, and later there is a shot of her topless corpse; close-up shots of knives and victims faces, and items such as repeated knife thrusts vs. single thrusts, are added to the murder scenes.
- The US version has a new score composed by Jimmy McHugh and Pete Rugolo.
- There is a b&w TV broadcast with Spanish subtitles, cut to 81 minutes.
- In the original British version, the title and credits appear over the scene of the first victim killed in this film. In the U.S. version, the title and credits appear on graphics that appear like knives stabbing across the screen.
- A version now exists which is the U.S. version, with its replacement score, but contains alternate shots containing topless nudity not included in earlier prints.
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