Major plot hole: When the victims of the sniper are being killed in the beginning of the movie, they fall not the way they are supposed to. Most of people were shot from the back or the side, yet they fall forwards instead of falling back of sideways. Of course, that was done to protect the stunt staff, but doesn’t seem realistic.
Moreover, when this scene is shown from the view of a spectator standing in the zone where the victims fell, their reenacting doesn’t coincide with how they fell in the primary scene.
Minor Plot Hole: When we see James Barr killing four people in Iraq, he’s shown wobbling and moving the riffle up and down. However, even if these people were running and he tried to shoot them, such movements wouldn’t help him to catch the targets.