Factual error: The action in this movie takes place in 1869, yet half of the handguns are 1873 Colt Peacemakers, and the remainder that are Army or Navy Colts are all cartridge conversions, which were not available until 1871.
Factual error: When Ty and Sunday face off, Ty plants a .44 in Sunday's breast pocket. However, as he presents the Colt, it is obvious that there are no cartridges in the weapon, no bullet noses are visible in any of the chambers.
Plot hole: When the Bigelows call Sackett out, Cap rises from his sickbed, takes a double-barrelled shotgun from over the door, breaks it open, and despite having used only a rifle and handgun up to this time, removes a couple of shotgun shells from his pocket and inserts them into the weapon.
Factual error: The boys join up with Don Luis for the trip from Abilene, Kansas to Santa Fe, New Mexico, a journey roughly South West. The morning after Tom Sunday's talk with Tyrel, they enjoy a clear morning's ride. With the rising sun shining brightly on the right side of their faces, almost as if they were headed north. Can't be Abilene, Texas, as that didn't exist until 1881.
