Trivia

To prepare herself to play the heroine with a checkered past, Carroll Baker actually worked a shift in an all-night diner (where she went unnoticed), made change in a penny arcade booth, visited a Tijuana brothel and so forth - publicity stunt "research" that was documented in a lengthy February 27 1965 Saturday Evening Post picture story called "The Lady Was A Tramp".

According to her autobiography, lead actress Carroll Baker was concerned about the film's script early in production and requested that a new writer be hired. The front office suggested she involve herself with only "girly" concerns, such as choosing the correct handbag for each scene, then stocked her studio dressing room with dozens the next day. Baker responded by slinging them out the door one by one, and later wrote, "Sylvia turned out to be one woman who never carried a handbag."

There were several major changes prior to production. Viveca Lindfors was brought in to replace Jo Van Fleet, and Gordon Douglas took over from David Miller.

George Peppard was initially mentioned to play George Maharis' role.

One of three films originally promised to Paramount contract player Stella Stevens. The other two were The Carpetbaggers and Harlow. When the studio decided to cast the more experienced Baker in these roles. Stevens requested and received an early release from her seven year contract. She then signed with Columbia Pictures.