Previous comment said pilot door was removed in one scene and back in a later scene. This is incorrect. Later scene showed the rear door being opened, but the pilot door is still missing.
The ambassador's taped radio message says "help" at different times throughout the three playbacks: it's spoken at the beginning of the message when it's first played back, then at the end the next time, then at the beginning the last time.
When Jaime is trying to rescue Jack after the helicopter crashes, she pulls the pilot's door completely off, and tosses it aside. Later when the guerrillas come and investigate the crash site, the pilot's door is back in place, attached to the helicopter.
Obviously-fake rubber snake; a real snake goes limp when it is killed; its tail wouldn't shimmy for a moment after it falls to the ground.
At around 7:30 as the army plane takes off one can see the landing gear is made up of two rear wheels and one front. Then on the next shot of the landing gear going up it is made up of two front and two rear wheels. it is obviously a different plane.
At around 36:00 just before Jaime lifts the concrete block it shakes when she first touches it. it is obviously. made of foam so she can lift it.
The column that is over the ambassador's wife is obviously a prop as it moves a little when she is pinned underneath as Jaime arrives.
Jaime rewinds the tape a lot farther than the brief message would take to be recorded.
The guerrillas' jeep is heard starting up, yet the headlights do not dim briefly the way they would if the motor was being cranked.
When they head out to examine the helicopter crash, the rebels soldiers leave the headlights of their jeep on even with the engine off. They would have no way of knowing how long they would be gone, so they would not risk coming back to a jeep with a dead battery, since this would prevent their being able to immediately use the vehicle to escape quickly or hurry to another battle site.