Well it was things like putting monument valley in TX... The movie should have been set in Utah, it would have made a lot more sense since that is where they shot it. But, they wanted him to be a TX ranger, so they had to come up with a way for that to happen by setting it in TX.
Promontory, UT was where they connected the rails, and they used scenery from UT, but Comanche territory and the TX rangers were not around there, so they made it TX. I guess being from the Western Side of TX and knowing what the scenery is supposed to look like, and seeing the Native American museums and artifacts (including Comanche) from around here tainted my view.