The original Broadway production of "Period of Adjustment" by Tennessee Williams opened at the Helen Hayes Theater in New York on November 10, 1960, and ran for 132 performances. The play starred Barbara Baxley (Isabel), Robert Webber (George), James Daly (Ralph), and Rosemary Murphy (Dorothea). The play was adapted for this movie by Isobel Lennart.
John Astin answers the phone in the party scene. He'd made his first uncredited film appearance onscreen in "West Side Story" the year before. He was just two years away from his break-out role of Gomez Addams in the first TV version of "The Addams Family" (1964).
The perfume Jane Fonda mentions as being in her blue zipper bag is Vol de Nuit. It was launched in 1933 by the French parfumier House of Guerlain.
Released the same date as "Whatever Happened to Baby Jane?"