The various Nazi uniforms in this picture are inaccurate - the colors are wrong and even the swastika has turned into a strangely shaped cross. This may have been for legal reasons, because in Germany the use of Nazi emblems is strictly regulated.
The film was made and released about 313 years after the French folk-tale "La Barbe bleue" of the same English name by Charles Perrault had been first published by Barbin in Paris in January of 1659 in the "Histoires ou contes du temps passé".
An article in the July 5, 1972, edition of Variety says that three versions of Bluebeard were made, a "sexploitation" for Germany, Scandanavia and Japan, a normal version for countries like U. S., England, France and Italy, and "a Spanish or Puritan version for Mid-Eastern, Iron Curtain and some Oriental (So. Korea) markets."
Second of two films in a just a couple of years where actor Richard Burton played a character who killed or had some of his wives killed with the first picture being Anne of the Thousand Days (1969) where Burton played King Henry VIII.
The trivia items below may give away important plot points.
Though mentioned on movie posters for the film, the methods of killing by which Bluebeard aka Baron Von Sepper (Richard Burton) killed his six wives and one other woman in the film were as follows: Magdalena, the former nun (Raquel Welch) - suffocated in a tomb; Greta (Karin Schubert) - shot whilst gaming; Elga (Virna Lisi) - beheaded by a guillotine; Brigitte (Marilù Tolo) - drowned in a vat of wine; Caroline (Agostina Belli) - falconated; and Erika (Nathalie Delon) and the prostitute (Sybil Danning) - a double murder, with both being pierced by a chandelier with a large ivory tusk.