Factual error: After they bury Jack's father, the stage driver hands Jack what he refers to as a "Navy" Colt. However, in 1841, the only colt handguns were a handful of Paterson revolvers, usually carried by Texas Rangers, and in fact, the revolver handed to the boy was a cartridge weapon.
Factual error: As a boy in 1841, Jack and his father take passage on an Overland Stage Company coach. However, this company wasn't in existence until the late 1850's.
