Another interesting detail: Marie Elise Eugene is not
credited in the opening titles in Passi di morte
but she is credited in various poster-art for the film (as Marie Liz Eugene). Look here:
The credits on the poster seems to be more correct than the credits in the film: for example Vera Krouska's name is spelled "Vera Kruska" in the film but in the poster the name is correctly spelled as "Vera Krouska". The poster also has no credit for Imelde Marani (who we know does not appear) and Albertina Capuani (who must be a fake credit) but Maimone and Eugene (who we know are in the film) are credited, plus Barbara Seidel. So in my opinion this means that Barbara Seidel is a real credit and not a fake one like Albertina Capuani. According to IMDb, Barbara Seidel is also in Metti... che ti rompo il muso
(1973), so this is the next film we must see! The search for the unknwon Passi di morte actors contiunues!