Prince Frederic says that he loves American gangster movies but they didn't become popular amongst American cinema goers until the 1930's and the episode takes place in the prior decade.
The character of Ann Grey is based upon Evelyn Nesbitt Thaw, a showgirl who was a central figure in an early 20th century murder case.
You see something in this episode that you would NEVER see on television today. Dorothy Provine, a white actress, appears in blackface for her second singing number, Swannee, How I Love You.
This episode is a rarity for the early 1960's in that it features some Afro-American characters.