Other mistake: In the scene where Tzekel-Kan reveals the big tiger thing, he is on his knees facing it. He says "do as I command" and raises his right arm and the tiger raises his left arm. The tiger and Tzekel-Kan should both raise the same hand because the tiger is built to mimic Tzekel-Kan's exact moves.
The Road to El Dorado (2000)
1 other mistake - chronological order
Directed by: Bibo Bergeron, Will Finn, Don Paul, Jeffrey Katzenberg
Starring: Kenneth Branagh, Kevin Kline, Armand Assante, Rosie Perez
Continuity mistake: After the ball game, there is a cut over Miguel's eyebrow. Right after this scene, the cut has disappeared.
Trivia: Just after the two main characters stow away on the ship, the movie cuts to a nighttime shot that firstly shows the moon, then pans down to the barrels. The moon shown is the same moon that Dreamworks (the company backing the movie) uses for their logo.
More questions & answers from The Road to El Dorado
Answer: Miguel had just told Chief Tanni how loyal Tulio and he were to each other. Then he overheard Tulio saying to Chel that he wanted to go to Spain with her, ONLY with her "Forget Miguel." That's why Miguel was so upset, because Tulio excluded him from his plans and his life.