When Adam comes across Howard Meade robbing the Brunners, he is first seen on horseback dressed all in black with no jacket, but immediately after when he attacks Howard, he is wearing a light colored jacket.
Hoyt Axton is shown playing a guitar known as a Dreadnought. Dreadnought guitars were not invented and marketed until 1916. The show is set in the 1860's and 1870's.