I don't know Luise Rainer but apparently she was hot stuff at the time, having just won back-to-back Best Actress Oscars. It looks like her film career only really lasted about four years. This film was jarring (by today's standards) in its depiction of happy slaves and the language used in connection with them. When Frou Frou meets the household slaves she is introduced to the two Maries ('Yellow' Marie and 'Brown' Marie) and to a young slave without a name who goes by the appellation "Pick", short for pickaninny.
Familiar face: Frou Frou's father was played by H.B. Warner, Mr. Gower from It's a Wonderful Life
Frou Frou meets the household slaves
George must quell an argument among the "darkies" because Frou Frou does not maintain a well-run house.