In joke: Marilyn Horne's character is called "Jackie", which was not only Miss Horne's nickname, but also the name she used as a young session singer.
Second and final appearance of Oscar's girlfriend Phyllis, played by Janice Lynde. There was also no explanation given why Phyllis did not attend the production of "Carmen" that Oscar participated in, or why she wasn't at least backstage after the show with him.