Marines don't wear their rank insignia on their covers (hats) as depicted in the movie. [I spent 4yrs in the MARINE CORPS! I remember putting my rank insignia on my cover just like the movie.]

Throughout the movie the face paint on Berenger and Zane gets lighter and darker. [The director gives us one shot of them putting on face paint, but over time it will wear off with sweat, and need to be applied again. It could just be the face paint wearing off, and being re-applied a few times. There would be no need for us to watch them put on face paint more than once.]

Berenger slugs the guy in the right side with his own rifle, but the guy falls back holding his left arm. [After he is hit in the side, the Panamanian stumbles and almost falls with both his arms outstretched. We then get a close-up of his face, where his right hand can briefly be seen hovering above his left arm, NOT clutching it. This is a natural place for his hand to be, if he was pressing his right upper arm into his injured ribs, and attempting to shield his upper body with the same arm at the same time.]

When Berenger goes to kill the guy that has seen Zane the guy whacks him with a board than says something in Spanish which his mouth doesn't utter. [Yes, it does. His mouth moves just fine, even though he is muttering, which does not require much lip movement. He is still clearly speaking the words.]

In any scene with Billy Zane, his character is shown with a fancy sniper rifle. This sniper rifle is supposed to be a Heckler & Koch PSG-1 (about $10,000). Obviously the director didn't want to be banging one of those around in the jungle as in the movie Billy Zane's "PSG-1" has a front ghost-ring sight in addition to the scope. A real PSG-1 does not have a front sight at all as the scope (a fixed 6x Hensoldt) is affixed to the rifle before it leaves the factory. The H&K MSG-90 is the military version of the PSG-1, it has a ghost ring site, however it does not have the expensive pistol-grip/buttstock that the PSG-1 is famous for. Hence to save cost they mocked up a MSG-90 (about $3,000) to look like a PSG-1 (about $10,000). [The weapon used was not an MSG-90. It was an SR-9(TC). This is a civilian version of the PSG-1, with a few differences, such as the front sight.]

When Tom Berenger's character is in his ghillie suit in the open field and guards are patrolling with dogs there is no way that his scent is going to be disguised by snuggling up to a pile of manure, especially after his and Zane's characters have been getting ripe from days of operating in the bush. [He doesn't hide his scent, but tricks the guards into thinking the dogs are interested in the manure.]