Factual error: In the movie, there is a whole pack of jaguars. Jaguars are actually solitary animals.
Continuity mistake: Whenever you see Pacha raise his arms or angles where you can see his undershirt under his green tunic, his undershirt is the same brown as his skirt/kilt and matches it. But in scenes where he takes his tunic off, his undershirt becomes white.
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.