The film was popular in the U.S., debuting at #24 on "Variety"'s list of top films. It eventually grossed over $1 million, making it one of the highest grossing films of 1972.
According to the Amercian Film Intitute's Catalog entry for this picture, William Marshall's Mamuwalde was the first black vampire to appear in films.
In the beginning, Mamwalde refers to a Doctor Duvalier. At the time, Haiti was ruled by Doc Duvalier, a voodoo practitioner. #HistoricallyAccurate