Elizabeth Taylor and her husband, Mike Todd, had planned for Cat on a Hot Tin Roof (1958) to be her final film, as she intended to retire from the screen. Todd had made a verbal agreement about this with MGM, but after his death, MGM forced Taylor to make this film in order to fulfill the terms of her studio contract. As a result, Taylor refused to speak to the director for the entire production, and hated the film.
Prior to the advent of digital technology, telephone exchanges were named instead of being numbered. Thus, Butterfield 8 (BU8 or 288) was the name of the exchange that provided service to ritzy precincts of Manhattan's Upper East Side
Weston's car is a 1957 Mercedes-Benz 300d "Adenauer" - the make's top-of-the-line production car at the time, and in a rare beige color. It would have cost $6,600 at the time which equates to $59,300 in 2018.
This film features the only dramatic role in Eddie Fisher's career, and the only film he made - in a major credited role - with wife Elizabeth Taylor. Just a year before, in Suddenly, Last Summer (1959), Fisher had briefly appeared, uncredited, in one scene with Liz.
The trivia items below may give away important plot points.
John O'Hara's 1935 novel is about the death of a call-girl and could not be filmed due to the Production Code. The novel was based on the death of Starr Faithfull, a 25-year-old woman whose body washed up onto the shore of Long Island in 1931 and became a sensation in the New York press due to her checkered sexual history.
This picture and Elmer Gantry (1960) are the only two films in which actresses (Elizabeth Taylor and Shirley Jones) win Oscars at the same time for playing prostitutes (Taylor for Best Actress and Jones for Best Supporting Actress).