The helicopter in the final action scene has a green colour scheme when it first takes off with Bus Carter in it. When Hannibal and Murdoch take control of it, it has a blue colour scheme.
At the part when they hold up the train for the second time the modified handcar has the dust from bullet hits on the armour plating long before the horse rustlers started firing. The next shot the marks are not there and appear as they shoot at it.
Three different helicopters are used being portrayed as being the same one: First is a Bell 206L Long Ranger (green/white), the second is a Bell 206 Jet Ranger II (green/white) and the last was also a JetRanger II (blue/white).