It's based on the real-life feud between two of old Hollywood's stars, Bette Davis and Joan Crawford.

Bette Davis won two Oscars, for "Dangerous" (1935) and "Jezebel" (1938). In 1963, she was nominated (instead of costar Joan Crawford) for her role in "What Ever Happened to Baby Jane?"

Joan Crawford won an Oscar in 1946 for her role in "Mildred Pierce."