Factual error: This aircraft configuration is completely unsuitable for a static line jump. The jumper would sit in the door and wait for the pilot to roll the aircraft to the left, then simply fall away from the aircraft, clearing all structures aft of the exit point.
Deliberate mistake: When Rambo attacks the POW camp with the Hue helicopter you can at one point see that the rocket pods carries 7 rockets each, however during the attack Rambo launches roughly 26 rockets from each pod as they fire simultaneously.
Factual error: The Russian special forces soldiers arrive in an American made Huey helicopter. Also, the "Hind" helicopter is a European Puma with wings.
Chosen answer: Probably because the first film is set in the United States, and Rambo's opponents are non-military, but the sequels are set in Asia and the opponents are "foreign" (mostly Soviet) soldiers.
Sierra1 ★