Factual error: Although set in rural Wyoming, Einar's truck is a mid-60's Mercury brand pickup. Mercury brand trucks were only sold in Canada.
Factual error: Toward the end of the film, when Gary is riding a bus from Wyoming through Nebraska he should be traveling towards the east. As the bus pulls away from the stop near Loma, Nebraska the sun is on the left side of the bus, indicating that it is traveling to the west.