Trivia: L. Frank Baum
- Cameo Prop: Baum died before MGM's version of The Wizard of Oz was filmed, but, in a remarkable coincidence, Frank Morgan as Professor Marvel wore a secondhand coat that turned out to have belonged to the author. (It's true; Snopes confirms it.)
- Creator Backlash: While he didn't exactly hate the book that made him famous, he was disappointed that none of his other literary attempts were anywhere near as successful, forcing him to continue writing Oz sequels for the money. He tried several times to end the series (for instance, by having Oz be permanently cut off from communication the outside world), but the public would have none of it.