6 donne per l'assassino

Most of the male characters were dubbed by Paul Frees for the American release of this film, including Cameron Mitchell. Evidently the Woolner Brothers couldn't be bothered to bring him in to loop his own lines.

In one English-dubbed print, the handwritten message of the killer is in German.

The original European version opened with a title sequence in which the camera focuses on each cast member as their name appears on the screen. The US distributors, Lawrence Woolner and Bernard Woolner, hired Filmation Studios to create a new title sequence featuring a montage of mannequins and skulls. The original title sequence has been restored on VCI Home Video's DVD release. The original US release removed a shot of the bathwater turning blood red in Claude Dantes' death scene. This shot was seen in the montage of scenes used in Matador (1986), and has been restored on VCI Home Video's DVD release.

Featured in Matador (1986)