During the infiltration/attack Jonah's carbine switches from an XM-177 to a Colt Commando and back again.
During the attack on the compound both the Hunters' and Nazi's weapons emit muzzle flashes but the actions do not cycle indicating the muzzle flashes are CGI.
Sister Harriet is showing Offerman a map of Buenos Aires province, saying that kill sites are bordering woodlands not far from Buenos Aires. The very next scene establishes this forest to be in a valley next to mountains. However, Buenos Aires and the surrounding pampas are flat treeless plains. The nearest mountains, the Andes Mountains, are 600 miles to the west.