Deliberate mistake: In the shot where the F-14 and F5 canopies are only 3-feet apart, you can see that the writing on the side of MAVs F-14 is backwards. Also, if the F-14 was inverted, with the sun more-or-less above, its cockpit would be in shadow, not with sunlight on the nose, as seen. (00:08:55)
Deliberate mistake: Throughout the entire movie, every time Charlie Sheen is not wearing his helmet, especially when he's out in the field in this tropical climate, his hair is always meticulously combed back, blow-dried and puffy. As a veteran, I know from personal experience that when you take your helmet off, especially in a climate like that, the reality is your hair will be messy, sweaty, pressed flat and most unattractive.
Deliberate mistake: In the prom scene at the end, there is a shot of a couple dancing with his hand on her rear-end. A counselor comes over and hits the boy's hand to make him move it. He complies, they kiss, and he puts his hand back when the counselor leaves. The camera cuts away to a different shot, and then returns to an over-head wide shot of the crowd. Down in the lower left-hand corner you can see the exact scene with the couple and counselor being filmed.
Deliberate mistake: During the gunfire of the Portuguese soldiers at the end, seconds before Jeremy Irons is killed, an old Indian woman is shot in her chest, but the actress/extra forgets to react and continues walking.
Deliberate mistake: While recon platoon is marching in their modified pt uniform, Gunny has "Cojones" call a cadence. Meanwhile Sgt. Webster maintains control of his formation, but from the wrong side. No platoon leader ever marches their unit from the right side of the formation.
Deliberate mistake: When Venus de Milo walks toward the back of the fluorescent "ZOO" sign (presumably on the way to her death at the hoofs of the zebras), the "Z" is reversed (that is, it appears unreversed on the back of the sign). This gives the first three letters of the word "ooze," doubtless because that is what Venus will return to. (The word "ooze" is used earlier in the film in just such a context (00:34:35-00:35:50).) A tree blocks the space where the "e" would be (or rather would not). (01:41:55 - 01:44:05)