Continuity mistake: When Carl Weathers gets killed, he is on the ground with his left arm lying across his forehead. The camera cuts away to Lee Marvin who walks back from the edge of the cliff to Weathers, and in the next view of Weathers, Weathers' other arm - his right - is now across his forehead.
Factual error: The spotter pilot is Captain Tucker of the Royal Canadian Air Force. But the RCAF of the 1930s used RAF ranks. He would actually be a Flight Lieutenant.