Character mistake: When Chris joins the Marine unit they are going to breach a door. Chris removes his shooting hand from his weapon to signal the breacher. He would have used his support hand.
Factual error: Throughout the training (sniper) and other times during the movie, shooters react like the rifle has a heavy kick, which they don't.
Factual error: The ranger is wearing an airborne tab above his 2nd Batt patch. They do not wear the airborne tab, rather they just wear jump wings. (01:39:38)
Character mistake: While watching the events of 9/11, the broadcaster notes that the "south tower is collapsing" while footage of the North tower's later collapse is showing. The south tower fell first, 29 minutes prior to the north tower. (00:22:25)
Chosen answer: Chris has "shooter's strawberries" on his elbows, which are red callouses caused by lying in the sniper's position for long periods. He notices the same marks on the elbows of the father, and realizes that he too is a military sniper.
Sierra1