In the first shoot out, first Jesse's gun is in his hand, then appears in his pants.
During the first shoot out, the railroad man is at first standing in front of his pinto, then he has moved sideways, away from his horse, then before it ends he is back in front of his horse.
During the Gallatin robbery the Youngers and Miller fire more shots than their six shooters would hold without reloading.
Jesse would not be standing taking the oath of fidelity to the union, he was shot in the chest trying to surrender and was bedridden for months.
The James family house was blown up by the Pinkertons in 1875, long after the James gang was active and wanted. It was blown up in a raid to find Jesse and Frank, and his mothers arm was blown off, in this version it was blown up before the James' crime spree and his mother's arm is intact afterward, but was blown off by a shotgun in a later attack on the James home.
Allan Pinkerton was never involved, himself, in shoot outs with the James-Younger gangs, nor was he robbed by them.
The James' brothers did not wait four years to begin their crime spree, it was less than a year after the war ended and probably by February, 1866.
Archie Clement was never a member of the James gang, although it is alleged Jesse and Frank were members of his gang. Clement never stopped raiding when the war stopped, he was shot by militia shortly after occupying Lexington, Missouri on election day in 1866.
When Annie comes to find the two James' brothers shooting up the room while bathing, you can clearly hear many believe to be someones pager vibrating. More likely it is a distant train whistle.
The newspaper headlines about the James Gang exploits during the movie and the underlying text had nothing to do with such captions as 'James Gang Robs Train' and 'Charlie Ford Captured'.
During the Northville raid, after Cole Younger (Randy Travis) kills the man who shot him off his horse, you can see two modern-day electrical transformers on a power line pole.
During the celebration of Jesse's new house one of the gang members is clearly carrying a modern Pump Action Shotgun. The earliest type of this weapon wasn't made till nearly a decade after James' death.
During the Northfield Minnesota Raid, Cole Younger uses a Lever Action 10-Gauge Shotgun to blast his way out of an ice house. The raid took place on September 7th, 1876 and the first models of this type of shotgun wouldn't exist until 1887, more than a decade later.
In one scene, Cole Younger (Randy Travis) is singing "Auld Lang Syne." That song was not written until 1788 by Robert Burns, a Scot. It did not become popular until the 1920's in the US, around the time that Guy Lombardo began playing it with his orchestra for New Years Eve performances.
The men are wearing trousers with belt loops. Belt loops were not invented until 1922.
Just before the train robbery where Jesse jumps on top of the train, two gang members chase after the train on horseback. Meanwhile, Jesse slides off the train and is hanging from the side, as the train goes over a bridge that appears to be over a deep ravine or canyon. After Jesse gets back on top of the train, the two riders on horseback are right behind the train as if it never went over a bridge.
When the wounded Jesse James falls into the arms of Frank at the fireplace a microphone is visible on the top of the screen.