This was Jack Lemmon's second feature film, and the second time he was paired on-screen opposite Judy Holliday. They were first cast together in It Should Happen to You (1954), Lemmon's debut film, from 1954.
Columbia Pictures approached George Axelrod to produce a film version of his very popular play, "The Seven Year Itch," but the film rights were tied up as long as it was running on Broadway. He instead offered them "Phffft," an earlier play of his dealing with a similar subject.
The title "Phffft" comes from Walter Winchell's column, which was widely read during the 1950s. When a celebrity couple's marriage broke up, Winchell would describe the break-up as "phffft."
When Nina mentions she has her own TV show and is making $40,000 per year, that would equate to $354,000 in 2015.
Included among the American Film Institute's 2000 list of the 500 movies nominated for the Top 100 Funniest American Movies.