When the confederates are running the cattle across the bridge there are fences protruding out to the sides to guide them across. The fences were not there when they went to steal the cattle.
Sergeant Hatcher is wearing a bandoleer of .45-70 cartridges at least eight years before the .45-70 was developed.
Despite the firepower of the Union Cavalry at the bridge, not one steer is seen to fall down dead or wounded. There are fallen cattle seen after the herd has crossed the bridge, but these are obviously live cattle with their legs tied, as can be seen when they struggle to stand up.
In the ambush at the bridge, the Union solider nearest the camera has a '66 Winchester with a wooden forestock, not a Henry as would be normal for the period.