MGM hairstylist Sydney Guilaroff dyed Lucille Ball's hair flame red for this film, the color that she kept for the rest of her life and became her trademark.
Ann Sothern was cast as May Daly (Madame Du Barry) until it was discovered that she was pregnant, at which point the role was given to Lucille Ball, which necessitated a vocal double for Ball's singing.
Although Lucille Ball was dubbed by Martha Mears in the performance of the title song, she did her own singing for "Friendship"--a song she would reprise years later on I Love Lucy (1951).
During the main titles of the film, if one pays less attention to the credits, the figurine in the background can clearly be seen executing a striptease, with a new article of clothing coming off every time the frame moves to a new set of credits.
Lucille Ball was so impressed with cinematographer Karl Freund that she later hired him to shoot "I Love Lucy."