Language Ananchronisms

I haven't been keeping close tabs on this but here are a few of the most egregious examples along with a surprising one.

In a Season 2 (I think) episode, Mingo uses the term "psychological advantage," which I was surprised actually was in use in the 1700s and he could have picked up in his Oxford studies.

Season 2, Episode 6 is entitled "The Trek," and the word is used in dialogue. "Trek" is a South African word and would not have been heard on the American frontier.

Season 3, episode 10: Except for a Season 1 episode where Yadkin said something which might or might not have been "Okay," this is the first time I have heard a clear use of "Okay" in this series. It was first used in 1839 but not in wide use until later.

I also heard "shut up" a whole lot of times, particularly in one episode in which they used it constantly, which supposedly dates from 1840 but is said to have been used in Shakespeare's King Lear and earlier sources.

I'm sure there are plenty more; these are the ones which stood out.