The third installment in Robert Aldrich's loose trilogy of "Grand Guignol" films (horror-thrillers featuring older women going crazy), following What Ever Happened to Baby Jane? (1962) and Hush...Hush, Sweet Charlotte (1964). Aldrich served as producer for this film.
The wooden statue that Mrs. Marrable buys and places on her mantle is a carving of St. Francis.
The film was #1 at the box office for the week ending July 30, 1969.
Mrs. Marrable's car is a 1960 Lincoln Continental.