Because of the minimal amount of editing needed during post-production, writer-director Albert Brooks was able to deliver his final cut to the Columbia Pictures studio about two weeks earlier than expected. This facilitated the film's U.S. release date being brought forward about a couple of months from May 1981 back to March 1981.
The director in the movie of the film that editor Robert Cole (Albert Brooks) is editing is real life director James L. Brooks who would later cast and direct Albert Brooks in Broadcast News (1987).
Albert Brooks' real-life brother Bob Einstein (aka Super Dave Osborne) plays the sporting-goods salesman.
According to Albert Brooks, Stanley Kubrick called him after the movie came out and told him he always wanted to do a film about jealousy. Later Kubrick made Eyes Wide Shut (1999) which explores the same theme.
A test-screening for college students in California turned out to be such a success that very little of the film had to be altered and the final cut could be delivered to the studio ahead of schedule.