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Factual error: John Carter, while gold prospecting in 1868, is arrested by members of the 7th Cavalry, with the intention of employing him to fight the Apache in the Arizona and New Mexico Territories. Unfortunately, in 1868, the 7th was otherwise employed in Kansas and Indian Territory forcing the Cheyenne, Kiowa, and Comanche tribes back on their reservations.
Continuity: When Edgar Rice Burroughs receives the diary from John Carter's attorney on the table, he grabs the book and turns it around to have the book's spine on this left hand. However, when the attorney stands up and shakes Edgar's hand to say goodbye, the book appears with the spine to his right.