Continuity mistake: In the overhead scene of the first village, after the rebels had slaughtered all the remaining people, all the people strewn across the street are completely clean, no gunshot wounds, no blood, no gore or anything. Also in the same scene, the people that stayed behind (exceptions being the two nuns and the priest) had been so severely injured that they were unable to walk, so how did they miraculously heal themselves after they were attacked?
Continuity mistake: When the refugees cross a river Dr. Kendricks is carrying a little child. The child is facing away from her, with its right arm around her neck. When the camera angle changes she is holding the child face-to-face, and now its left arm is around her neck. Then a soldier takes the child from her while it is facing away from him, but when the camera angle changes again the child is turned around and facing him.
Continuity mistake: During the rebels' first major attack on the fleeing party, there is a lull in the fighting where Lt. Waters runs to find out whether Lena Kendricks is okay. When he reaches her, he lifts her up and she places her right hand against her ear. However, during different shots in this scene as he is talking to her, her hand goes from being next to her ear to not being there, several times.
Continuity mistake: If you watch the air support coming in to bomb the enemy troops from the time they take off to the time they leave, their load out varies a number of times. Watch as they approach for their bombing run - the weapons switch from white finned missiles to yellow-tipped green bombs and back before being fired.
Continuity mistake: At the end of the movie, when Lt A.K. Waters and Dr Lena Hendricks are in the helicopter awaiting take off, he is sitting on her left and rests his head on her left shoulder. However, in the next shot as the helicopter takes off, he is sitting on her right side.
Continuity mistake: When Bruce Willis is on the phone with Tom Skerritt, Skerritt is holding the phone with his right hand and the antenna pointing up. In his next shot we see him with the phone in his left hand and antenna pointing down. So he could have changed hands but it doesn't seem very likely.