Debut role of future adult film star Marilyn Chambers portraying Barney's Girl. She was billed in the credits as Evelyn Lang. She was 18 and still in high school. Her dream was to make it big in mainstream films, but two years later she was talked into starting in the X-rated movie Behind the Green Door. After that, no one would hire her for mainstream films for many years.
George Segal was not the initial choice to star opposite Barbra Streisand; she wanted her fellow First Artists producer Sidney Poitier, who was rejected when it was felt that audiences might not yet be altogether accepting of an interracial relationship in a major comedy release.
Star Barbra Streisand between takes painted and studied painting. The actress had to wear special plastic gloves in order to protect her make-up manicure for her film character. Reportedly, because Streisand was a fan of the modernist artist Frank Stella, producer Ray Stark gave her an artist's smock embroidered with the name "Streisella".
The nude scenes with Barbra Streisand, cut from the film before release, later turned up being published in the November 1979 edition of US men's adult magazine "High Society". This prompted a US $5 million lawsuit and injunction from Streisand who won the court case. Years later that scene would start popping up all over the Internet.
Ken Adam: Uncredited, the film's design supervisor and famed James Bond franchise production designer as a middle-aged man.