Continuity mistake: In the beginning where Bob and Donnie are watching over the road waiting for the returning troops, the bolt of the M40 rifle Bob has at the ready is closed. In the shot right after Donnie pulls out the picture of Sara, the bolt is shown open, but appears not to be fully open. In the next shot of the rifle, the bolt is again closed. We do not hear the bolt, nor would a sniper at the ready fumble with an arm at the ready.
Continuity mistake: Close to the end the movie, when the helicopter Danny Glover is in is approaching, we see a reflection in its high gloss paint: mountains, snow, rocks. When it lands, the paint is matte blue, no reflection. We would have seen the camera crew easily if it had still been glossy.
Continuity mistake: In the very beginning of the film when Swagger takes out the enemy's truck approaching friendly troops, the truck flips over onto its side and two pieces of the truck spill out onto the road, yet when the friendly troops approach/pass it the objects are nowhere to be seen.
Continuity mistake: Approximately 3 minutes into the film, the scene cuts from Bobby Lee Swagger and his scouter to the U.S. Camp in Ethiopia, you can see a truck pulling into the camp, if you watch closely from the beginning of this scene to the following overhead shot, there are a few changes, the U.S. flag on top of the camouflaged tent disappears, there are twice as many red barrels at the entrance to the camp than in the previous shot.
Factual error: When FBI agent Memphis is reviewing the assassination on video, you can hear the shot first and then see the blood spray of the bullet impact on the Archbishop. This defies physics as bullets travel faster than the speed of sound. Given the distance the sniper shot from, the sound of the shot would be be heard a second or 2 after the impact.
Continuity mistake: When Swagger is in the stolen FBI car at the assumed end of the car wash, we hear the wheels "peeling out" and the scene shows the back of the car, wet. Then, the scene quickly changes to the FBI car speeding out of the car wash completely dry with just a little water on the windows.
Revealing mistake: When Gunny snipers the shotgun (and hand) off the bad guy in the snow covered mountains, his rifle is right-handed bolt, and he shoots right-handed except for the mountain scenes. He closes his right eye before he shoots, and it even shows a close-up of his left finger on the trigger, obviously a flipped shot.
Visible crew/equipment: About half way through the film when they go to see the old gun smith, as they get out of the truck and just after Swagger says "welcome to Tennessee, the patron state of shooting stuff" and closes the truck door, you can see a reflection of someone holding a board or something in the wing mirror.
Factual error: Bob and Nick engage in a shootout in Lynchburg Virgina in the late afternoon (according to FBI Howard), then call him from Bozeman, Montana, the very next morning, standing in front of the very same Dodge pickup. Even allowing for the passage of 18 hours, they would have had to average over 119 mph, not allowing for fuel stops, to get there.
Continuity mistake: When Swagger kills the senator, he uses the last bullet in the magazine, this is seen by the gun slide being locked back. If there had been more bullets it would have reloaded and gone back to the original position. However a millisecond later, in the next clip the gun has been reloaded.