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 film was #1 at the box office for the week ending July 30, 1969.
The wooden statue that Mrs. Marrable buys and places on her mantle is a carving of St. Francis.
Mrs. Marrable's infamous pine trees are long leaf pines, a hardy, tough variety of fir tree that grows well in rocky soils.