The film is also know as The Rue Morgue Massacre.
The German DVD from Anolis Entertainment has a commentary track with Paul Naschy. He says that the love scene between he and Elke was removed and burnt by the Spanish censor because they were fully nude. He claims that he had a hump with fake hair on top during this scene. The Anolis Entertainment DVD only shows a side view of a topless Elke. This is known as the 'alternate nude scene', and is included in the 'uncut international version'. The Anolis Entertainment DVD also includes the 'standard clothed version' of the love scene as an extra.