Crew or equipment visible
Errors in geography
When Boy and Gabriel are found by the creek there is a young African-American soldier with the Union band. Then later Gabriel, a young African-American boy, is seen fighting along side Union troops. Free Blacks and former slaves did not integrate into Union regiments, but instead, served in all-Negro regiments.
Just as the fight is ending, and Mr. Carroll is about to shoot Pa Anderson with his gun, you see the Boy in the water trough about to make an attempt to grab him. However, the actor pulls back at the last minute, obviously aware that his attempt to grab Carroll is mis-timed when Jenny shoots the gun out of his hand.
The locomotive on the train that gets burned is equipped with air brakes, which were not invented until 1872. Although the locomotive is mostly filmed at such an angle that the air brake equipment is not visible, a connecting air hose can be seen on the front when the train is stopping for the fire on the track, and whenever the train is stopped, hissing noises from the air compressor can be heard.