Factual errors: When the boys cross the Missouri River from St. Joseph, one utters the words, "Say goodbye to the U.S.A." After January 29, 1861, what was across the river from St. Joe was the state of Kansas, so they never left the U.S.A. In fact, by the 1850s, to ride out of the U.S.A. they would have needed to have gone to the Canadian or Mexican border.
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