Trivia: Hattie McDaniel's portrayal of Mammy earned her an Academy Award, the first to be given to an African American.
Trivia: Professor Marvel, the Cabbie, the doorman, the guard, and the wizard himself are all the same actor, Frank Morgan.
Trivia: Originally planned to be filmed in color but that was dropped. Some say it was because of the high costs of color film and cameras. Others say that the Karloff monster makeup, grey-green greasepaint worked for black and white lighting and filming, but looked ridiculous in color. There are surviving home movies made during the filming of Son, showing Karloff in his makeup and vest. You can decide if the right decision was made.
Trivia: Casper the Caveman is a caricature of the American comedian Jack Benny.
Trivia: Robert Donat won his only Oscar for his role as Mr. Chips in this movie.