Revealing mistake: After the swarm of locusts passes, Frank takes one and eats half of it. He then offers the other half to Hidalgo, but the horse knocks it out of his fingers and proceeds to eat something else hidden in his hand - presumably the real treat used to entice him.
Hidalgo (2004)
1 revealing mistake - chronological order
Directed by: Joe Johnston
Starring: Viggo Mortensen, Omar Sharif, Louise Lombard, Zuleikha Robinson
Factual error: The race ends at Damascus, which is nowhere near the ocean, yet is placed on the seacoast.
Aziz: What shall I tell his Excellency?
Frank T. Hopkins: You can tell him pound sand for all I care.
Trivia: Viggo Mortensen liked the horse that was used in the movie so much that he bought it.
Answer: They take the camel roads, which are easier (and faster) to navigate.
Xofer