Continuity mistake: Kronk cuts the rope holding the chandelier with the dagger, leaving a cut piece of rope next to him. The chandelier falls towards Yzma, then she pulls a lever which opens a trapdoor below Kronk, and the cut piece of rope is now a lot shorter than it was when he cut it. (01:03:58)
Continuity mistake: When Chicha is measuring Tipo's height, she makes a mark above his head on the wood. Two shots later, that mark has vanished. (00:21:11)
Continuity mistake: When Yzma and Kronk are in Pacha's house, Yzma knocks her cup of tea off the table, then Chicha picks it up and sets it next to the teapot on the table. Three shots later, the cup has vanished from the table. (00:58:15)
Other mistake: Right before Kronk leaves Pacha's house, Chaca's hair has a green stick on the left and a red stick on the right. However, every other time Chaca is on screen, these colours are the other way around. (01:00:29)
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.