Factual error: Calendar date at the very beginning of the film (in the police station), shows the dates of Saturday 20th/Sunday 21st July 1983. However the 20th and 21st July 1983 fell on Wednesday and Thursday.
Factual error: At the very beginning of the film, Gunny Highway learns that he's being reassigned to the 2nd Marine Division. The 2nd Division, located at Camp Lejeune, North Carolina, is situated on the NC coast; there are no mountains in the immediate vicinity. However, when the Gunny trains his platoon, he does so in the hills of another Marine training camp located in California. There is a big difference between California and North Carolina.
Factual error: Towards the end of the movie Lieutenant Ring is ordered to escort the rescued students to Cherry Point. When they arrive they are actually at MCAS El Toro, not MCAS Cherry Point. Any Marine who has been at both air stations can immediately tell the difference.
Factual error: At the end of the movie when Gunny Highway and his men land at what is supposed to be Cherry Point, the band playing the music should be the 2nd Marine Aircraft Wing Band, but is in fact the 1st Marine Division band as can be seen by the 1st Marine Division insignia on the drummer's drum.
Factual error: When the Recon Team were in Grenada, you don't see Swede carrying extra ammo belts for his M60. Neither does he have a buddy who could carry the additional combat load assuming they would be in boxes.