Other mistake: When Cloud Dancing and Daniel walk a wounded Sully to a clearing, we see a road with what looks like flattened black tents on either side, and Cloud Dancing tells them the Army must have attacked it; that's what is left of a reservation. When it's a modern transport road for everyday access, very poorly disguised as a reservation camp.
Dr. Quinn, Medicine Woman (1993)
1 other mistake in season 6 - chronological order
Starring: Jane Seymour, Joe Lando, Shawn Toovey, Chad Allen
Visible crew/equipment: While Dr. Mike is unsuccessfully trying to make supper Olive returns with the children, and after Olive says goodbye to them, when Dr. Mike closes the door a white T-mark is visible on the porch. (00:08:55)
Hank Lawson: I ain't stupid.
Olive Bray: Well, that's a matter of opinion.
More questions & answers from Dr. Quinn, Medicine Woman
Answer: A Cooper was someone who made various things out of wood including wooden caskets and even barrels.