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: 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.
Continuity mistake: When Gunny Highway first introduces himself to his recon team, he walks into their barracks building. This building was at the end of a row of barracks. Minutes later, when Highway walks out the back end of this building, he actually comes out of a different building further up the street.
Continuity mistake: Halfway through the film when Gunny Highway takes the troops on a run, one of his Marines suggests he's lost. Stitch Jones says "C'mon, let's smoke this sucka." All the troops run past Highway, with Jones leading the way. When the shot turns to a rear view, Jones is the last one to pass Highway.
Continuity mistake: Highway and Choozoo are in the bar when Little Mary Jackson tells them that their battalion has gone on full alert. They both leave the bar and it is night time (also a cut away clip of Aggie being driven past in a convertible car shows darkness). The scene then cuts to the barracks and throughout the scene, you can see through the thin curtains that it is daylight outside. The scene then cuts back to the parade ground and it is night time again.
Continuity mistake: In the last scene on Grenada, when the Col. lands his copter, it lands with the port (left) side of the copter facing the rock retaining wall. After the Col. tells Highway and Choozoo to "Get out of my LZ." As Highway and Choozoo walk away the starboard (right) side of the copter is facing the rock wall. You see the tail facing the camera.
Revealing mistake: Near the end they land on the island. After they cross a bridge a soldier shoots an explosive and blows up a machine gun position. Just after that, look at the muzzle of Highway's rifle. It isn't open like it should be but has a type of plug to ensure only blanks can be used.