Véronique Djaouti broke three vertebrae wearing the bat wings. She did the role out of friendship to Jean Rollin and refused to sue him despite permanent damage.
Tina Aumont accidentally learned the role of La Louve and ended up improvising much of La Goule's dialogue. She was very upset about learning the wrong part and cried on the set and at the restaurant nearby because she thought her mistake had ruined the film.
Isabelle Teboul was terrified of hurting Bernard Charnacé with the knife and got the scene right in only the take that was used in the film.