Continuity mistake: When John holds the match in the cave, the amount of match remaining varies between shots.
Continuity mistake: 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.
Continuity mistake: During the wedding between Dejah and Than when they are about to drink the water, Than's tattoo is on the right side of his face whereas in other scenes his tattoo is on his left. (01:46:25)