Factual error: Upon completing the task of lowering every wagon, horse, mule, ox and human down to the canyon floor, the settlers proceed to build rafts for their wagons..however, their scout would have informed them that they would be going overland to intercept the Columbia River to the northwest. The Snake River, with class IV rapids, (even now tamed with dams) was no place for the uninitiated to go rafting.
Factual error: The highly unstable explosive nitroglycerin plays a crucial role in the film, as it is painstakingly stolen and then used to obliterate a wooden bridge that separates the War Wagon from its armed escort. However, at the end of the film, a single bottle of this incredibly volatile stuff somehow survives to be stolen by an Indian brave who haphazardly snatches it (thinking it is a bottle of whiskey) and scampers away with it. Any one of the Indian's actions, from roughly snatching it to leaping off the wagon with it and impacting the ground, should have detonated the nitroglycerin. The leader of the Indian war party even chugs a mouthful of the Nitro and violently spits it out, the action of which should have exploded his head. But the nitroglycerin doesn't explode until the Indian leader finally throws the bottle to the ground.