Other mistake: When in the tub in Arkansas, Wyatt is bare chested. In bed with Josie he's suddenly sprouted a lush garden of chest hair.
Other mistake: The same Old West town was used for scenes taking place in Wichita and Tombstone. The mountains in the background are those that surround the Santa Fe, New Mexico movie set.
Other mistake: Beginning of the movie young Wyatt running through the corn field the rows were straight. I don't think horse and a planter can get them straight.
Suggested correction: This is an assumption, not a mistake.
A planter of that era wouldn't plant rows like that. At the time of that the horse drawn planter would be at best 2 rows per pass and used a trip to drop seed. Nothing like a modern looking planter would produce.