While singing the "If I Were King" song, the Lion asks, "What makes the Sphinx the Seventh Wonder?" The Sphinx is not one of the Seven Wonders of the World; its neighbour the Great Pyramid of Giza is.

"Over the Rainbow", which the American Film Institute recently named the greatest movie song of all time, was nearly cut from the film.

The horses in Emerald City palace were colored with Jell-O crystals. The relevant scenes had to be shot quickly, before the horses started to lick it off.

Liza Minelli, the daughter of Judy Garland, was once married to TV producer Jack Haley Jr., the son of the Tin Man.

The coat that Frank Morgan wears as Professor Marvel was bought second-hand for the film. It was only discovered later that it once belonged to L. Frank Baum, the creator of the Oz stories. The name sewn into the garment was shown to his widow, who confirmed that the coat did indeed once belong to the author.

In Frank L. Baum's books, Dorothy was actually about 11 years old. As Judy Garland was in her mid-teens when she was cast, MGM pulled out all the stops to make her look as young as possible. Already on a chicken soup-only diet and appetite suppressants (as she was a little too chubby for the studio's liking), MGM upped her dosage and had a corset made to flatten any signs of a womanly figure. Garland had to have special lessons on how to walk, talk and dance normally as the corset was so tight. The costume department dressed her in a childish pinafore dress and gave her little girl plaits too. Even with these efforts it's still clear to see that Garland looks older than 11 in the film.

Margaret Hamilton, who plays the Wicked Witch of the West, was a kindergarten teacher before becoming an actress.

The "tornado" was a thirty-five foot long muslin stocking, photographed with miniatures of a Kansas farm and fields.

According to lead Munchkin Jerry Maren, the "little people" on the set were paid $50 per week for a 6-day work week, while Toto received $125 per week.

The Director - Victor Fleming, was working on "Gone With The Wind" at the same time.

The Scarecrow was unable to say the correct Pythagorean Theorem (right after he got his brains), so after multiple attempts, the director simply selected the best take and used it.

The Cowardly Lion's facial makeup included a brown paper bag.

Buddy Ebson, the original actor hired to play the Tin Man, became very ill from the metallic makeup and was not able to appear in the movie, but his voice can still be heard singing "We're off to see the wizard," when Dorothy and her friends are dancing down the yellow brick road after the forest scene.

A Russian writer adapted "The Wizard of Oz" for Russian children. Dorothy was re-named Allie, and Toto could talk. He later wrote 5 more books about the adventures of Allie, her sister Annie, Toto, Scarecrow, Tinman and Lion. As far as I know, this book was never translated back into English.

The method used to make the house fall: Paint the sky on the floor, hold a toy house up against the camera which is elevated over the floor, film the house falling, then reverse the film. Voila.

The "oil" that was used to lubricate the Tin Man was not really oil. It was discovered that oil would not photograph well, so they used chocolate syrup instead.

In the original book by L. Frank Baum, Dorothy's slippers were not Ruby but Silver. The color was changed in the movie for technicolor purposes.

The horse of a different color driver, the doorsman, the wizard's guard, and the wizard are all the same actor.

Margaret Hamilton proved too authentic as the wicked witch as it was reported that mothers throughout the country had to carry their children out of movie theaters because the children were horrified by her make up.

Some of the more minor mistakes in the film may have been left in because there was no time to shoot more accurate takes. This picture wasn't expected to be as a big a hit as it was, and when it went over-budget and took longer than expected to shoot, a lot of pressure was put on the crew and director to finish it. MGM wanted to put Judy Garland in a film with Mickey Rooney, as he was a bigger star than she was (and the studio thought starring with him would help her career), so the crew of the film had to rush to get it all shot and edited so Garland could be released.