In the opening titles, the term "Devil Dogs" is said to have originated during World War II. In fact, the term was coined during World War I, and according to Marine Corps tradition, it referred to the ferocity the Marines showed during the Battle of Belleau Woods in 1918.
In the opening titles, the term "Leatherneck" is said to have originated during the Revolutionary War. In fact, these collars were not implemented until 1798, just before the Barbary Pirate war.
At around 18:24 when Carter searches for the keys in the second dead man's body, the dead man's legs twitches.
Around 18 minutes when Carter kills the two guys and saves the girl, he searches for the vehicle keys on their bodies.
As there were so many others pursuing them, how would Carter know one of them had the keys? Even if it was a hunch that worked out, how would Carter know in which direction to run to and find the vehicle?