Factual error: In the scene after the attack begins and military assets are spinning up to go help, when they briefly show the SOC guys loaded into a transport aircraft they all look operator-ish and have high cut fast helmets, but are carrying M16A4's with no optical devices mounted. I don't know of any SOCOM units that wear fast helmets but are issued A4's without an ACOG, ELCAN, aimpoint, etc. (00:15:00 - 01:25:00)
Factual error: The 2 C-class Mercedes Benz' they have in the CIA compound are the newer body styles that came out the year they were filming the movie. The Benghazi attack happened in 2012, the C-class had a different body style then.
Factual error: Toward the end of the movie there is a shot over the Mediterranean Sea with the sun rising. The shoreline at Benghazi generally runs northeast-southwest, meaning the point of view would be somewhere between these two directions. If we assume that the point of view is generally straight out to sea, this would make the point of view northwest.