Continuity: When Tulio and Miguel are stranded, the shark bites off the end of the rudder. In the next scene, it's intact again.
Continuity: After Tulio and Miguel arrive in El Dorado Miguel's earrings disappear and reappear between shots.
Factual errors: All of the Spaniards - Cortez, Tulio, and Miguel - immediately speak the same language as the inhabitants of El Dorado, when in fact the natives would not have known Spanish.
Continuity: When Tulio and Miguel are "arguing" about throwing off Tzekel-Kan, Tzekel-Kan changes position in the background between shots.
Continuity: When Miguel wins the map, it is rolled up vertically. At the treasure hunt, it's rolled up horizontally.
Continuity: When Miguel and Tulio are looking down from the roof, they see four barrels. After they jump, there are many barrels. When the net picks them up, there are six barrels.
Continuity: Altivo's horseshoes change colour throughout the final scenes.
Factual errors: Tulio mentions how they are now richer than the King of Spain. In 1519, there was no title 'King of Spain' The man who ruled Spain, Charles V, was known as the Holy Roman Emperor and ruled Spain as King of Aragon, Castile and Léon. The title 'King of Spain' was not used until Charles' son, Philip, became king in 1556.