1. This “fire” was actually apple juice spewing out of Dorothy’s shoes; the film was sped up to make it look like fire.
2. The Cowardly Lion’s facial makeup included pieces of a brown paper bag.
3. The steam shooting from the Tin Man’s cap startles Toto, who runs out of the shot.
4. Judy Garland couldn’t stop giggling while filming the scene in which Dorothy slaps the Cowardly Lion. The director, Victor Fleming, took her aside and slapped her. She returned to the set and filmed the scene in one take.
Garland can still be seen laughing in between the lines “Well, of course not” and “My, what a fuss you’re making.” (GIFed above.)