Factual error: All through the movie Pfc. Garlick is shown trying to turn the key on a jeep that is already running. The reason that this is a mistake is that tactical vehicles (jeeps) do not have ignition keys they have a starter button. So if you want to keep someone from stealing your jeep you padlock the steering wheel.
Continuity mistake: Garlick finds Cronauer sitting at a table with a couple of new friends in a local eatery and stands next to the DJ to tell him he has been reinstated to his job. At one point Cronauer grabs a piece of green salad with his chopsticks and puts it to his mouth and in the next shot from behind, it is the strands of white noodles that can be seen dangling from his lips.
Continuity mistake: Before Adrian Cronauer does his first broadcast on the air, he puts on headphones with a side cord on his right. After a quick cut to another man in a booth, the side cord has moved to the left, and just before the broadcast begins, the cord has moved back to its original position.
Factual error: The jeep they are driving into the jungle that gets blown off the road is actually a civilian jeep, as evidenced by the headlight trim rings being mounted on the outside of the grill. Military jeeps have the lights behind the grill to facilitate "blackout" lighting.