Continuity mistake: Charlie tells Alice that he buried the gold near the Mexican border. But when she looks up the location on a map, the map she's holding is of the state of Wyoming (which is nowhere near Mexico). When they go after the gold, however, they're in Joshua Tree Forest, Arizona, which is near the border.
Revealing mistake: Alice is supposedly playing the guitar while she sings to Charlie in the jail cell. But while her fingers are moving, they aren't forming proper chords on the instrument's strings, nor does her strumming match the music we hear.
Factual error: When Alice, Heyes and Curry dig up the gold bars, they realistically have to use both hands to lift each one. But Heyes then fills two cloth bags with six bars each, hefts the sacks easily and slings them over his saddle. Conservatively, each of those bags would weigh 180 lbs. - he's just tossed the equivalent weight of two full-grown men over his shoulder onto the horse. For more on just how heavy gold bars are, see: http://www.elmhurst.edu/~chm/vchembook/125Adensitygold.html
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