Judy Garland found it difficult to be afraid of Margaret Hamilton, because she was such a nice lady off-camera.
Many shots were trimmed down or edited out of the film because they were too intense for families and children. In particular, one deleted shot shows the tornado completely enveloping the farmhouse. Also, later in the film a lot of The Wicked Witch of the West's scenes were either trimmed or deleted entirely, as Margaret Hamilton's performance was thought to be too frightening for audiences.
Margaret Hamilton, a lifelong fan of the "Oz" books, was ecstatic when she learned the producers were considering her for a part in the film. When she phoned her agent to find out what role she was up for, her agent simply replied, "The witch, who else?"
The horses in the Emerald City were colored with gelatin powder. The relevant scenes had to be shot quickly before they started to lick it off.
In 1898 Dorothy Louise Gage was born to the brother and sister-in-law of Maud Gage Baum, wife of author L. Frank Baum. When little Dorothy died exactly five months later Maud was heartbroken. Baum was just finishing "The Wonderful Wizard of Oz" and, to comfort his wife, named his heroine after Dorothy, changing her last name to Gale in his third book. Dorothy Gage was buried in Evergreen Memorial Cemetery in Bloomington, IL, where her grave was forgotten until 1996 when it was rediscovered. When Mickey Carroll, one of the last existing Munchkins from the movie, learned of the discovery, he was eager to replace her deteriorated grave marker with a new one created by his own monument company. The new stone was dedicated in 1997 and the children's section of the cemetery renamed the Dorothy L. Gage Memorial Garden, in the hope that bereaved families would be comforted in thinking of their lost children as being with Dorothy from "The Wizard of Oz."