Feature-film debut of Lee Majors, who plays the small role of Lucy Harbin's (Joan Crawford's) husband in the flashback scene. He got the part when his good friend Rock Hudson asked William Castle to please find a job for the 23-year-old actor.
Mitchell Cox (Dr. Anderson) was not an actor, but was the Vice President of Public Relations for the Pepsi-Cola Company. Joan Crawford had given him the role without consulting producer/director William Castle.
The sculpture of Joan Crawford used in the film was real, created by Yucca Salamunich, a Yugoslav artist. The sculpture was originally presented to Crawford in 1941 on the set of Um Rosto de Mulher (1941).
Because of the success of O que Terá Acontecido a Baby Jane? (1962), Joan Crawford's career revived, giving her more power with the studios. She was able to negotiate a salary of $50,000 plus 15-20% of the profits, and received script and cast approval.
ACTRESS TRADEMARK (Joan Crawford): Pepsi. In the kitchen scenes at the beginning of the movie, a carton of Pepsi-Cola is prominently displayed on the counter. Joan Crawford was the widow of Alfred Steele, who had been CEO of the Pepsi-Cola Company. At the time of filming, Crawford, still on the Board of Directors, demanded that product placement shots be included in all of her films.