A boys' choir was used to provide the singing voices for the schoolgirl chorus that backs Judy on her numbers.
Billie Burke was married to Florenz Ziegfeld; Fanny Brice was one of the stars of Ziegfeld's Follies.
The blackface number, "Swing Low," is frequently removed when the film is shown on television.
Billie Burke and Judy Garland starred together again the following year, 1939, in The Wizard of Oz.