The little baby girl who appears at the beginning of the movie is the daughter of Howard Duff and Ida Lupino.
Ida Lupino was married to Howard Duff when this film was made
Ida Lupino, who co-wrote this film and stars as Emerald Club singer Lili, probably named the establishment after her mother, Connie Emerald.
According to Don Siegel in his biography, he and Ida Lupino - whose the producing company belonged to - often argued about some over the shoulders camera shots. They hardly understood each other.