Other mistake: During one of the games numerous 'radio-interviews', a local sheriff is calling to report, that he's been following an unidentified object for a while and that he had to 'hit the breaks' of his car to avoid collision. The subtitles should of course have read 'hit the brakes' instead of 'breaks'.
Factual error: Comanche were in the southern great plains, northern plains would have been Cree or Dakota peoples.