When his manager Mr.Sheldrake (Fred MacMurray) begins using Baxter's apartment in exchange for promoting him, Baxter is disappointed to learn that Sheldrake's mistress is Fran Kubelik (Shirley MacLaine), the elevator girl at work whom Baxter is interested in himself.
Wilder and Diamond also based the film partially on a Hollywood scandal in which high-powered agent Jennings Lang was shot by producer Walter Wanger for having an affair with Wanger's wife, actress Joan Bennett. During the affair, Lang used a low-level employee's apartment.