John Steiner revealed in an interview on a DVD release of this film that during the shooting of one scene involving numerous nude actresses that the crew members and assorted onlookers were more transfixed by his SS uniform than they were by the naked women.
The film was refused a UK cinema certificate in 1977 by the BBFC.
Rino Di Silvestro did extensive research on all the badges and uniforms worn by both the Nazi officers and the prisoners in the concentration camp.
Lina Polito was terrified when she read the script. Especially for nude scenes. Rino Di Silvestro told her, and then had him add on her contract, that she would never shoot completely naked, but in the end, on the screen, she would appear as if she were. She had a little coverage, a triangle on her pubis and stars on her nipples. Silvestro filmed it in such a way that these covers were never seen. And she finally looked naked, but she wasn't.
All the interiors for the prison camp were filmed at Bracciano Castle in Bracciano, Rome, Lazio, Italy.