Right after Dorothy falls asleep in the Poppy field and Glinda makes it snow to wake her, as Dorothy, Tinman, Scarecrow, and Lion, all skip away to get to the Wizard they have to go down a slight hill and on the way down Judy Garland (Dorothy) kind of stumbles and falls forward but quickly recovers.
I'm not absolutely sure about this, but I believe the small stumble was intentional. She was just poisoned by poppies and fell into a deep sleep as a result. Any time you wake up from a sleep you are a little groggy, especially if it was a result of poisoning. If I started to skip after all that, I would probably fall flat on my face, too.
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