Walter Matthau sings the title song, orchestrated by John Williams and written by Marilyn Bergman and Alan Bergman. It was also released as a single on the Decca label.
In one sequence, there is a movie theater marquee showing Lonely Are the Brave (1962). This was one of star Walter Matthau's earlier films.
In the cat fight scene, Geraldine Page calls Carol Burnett a dried-up old hag. Geraldine Page was almost ten years older than Carol Burnett.