did Argento reference it in SUSPIRIA?
The hanging scene (see my profile avatar) is very similar to that of SUSPIRIA, there's even an exploding glass ceiling.
Maybe Dario watched this movie prior to filming SUSPIRIA? The lighting and camerawork are also similar... that's not saying this is a good movie, but certainly interesting to cult movie buffs like me...
I wrote a message to Dario's buddy Luigi Cozzi, maybe he knows. Will keep you up-to-date.
www.cultmovies.info