Continuity mistake: Right after going over the waterfall, Pacha finds Emperor Kuzko unconscious. When he takes him onto land, his tongue is sticking out. In the next shot, it's back in his mouth.

The Emperor's New Groove (2000)
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Directed by: Mark Dindal
Starring: David Spade, Eartha Kitt, John Goodman, Patrick Warburton, Wendie Malick
Genres: Adventure, Animated, Comedy, Disney, Family, Fantasy
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Answer: It is probably attached with the equivalent of a piece of Scotch tape rolled over itself; I'm sure you've done that before. It wouldn't be visible to the naked eye, and Yzma would be able to flip the label up.