The markings on the small model aircraft used in the crash scenes are different to the markings on the larger mock-up crashed aircraft.
At the 5 minute mark Forrester drops bombs on the ack-ack guns, but the smoke from the bombs rises in front of his plane.
At the 1:30.23 mark, Forrester and Carrington share "the last of the water" just feet from a fruit-bearing prickly pear cactus Forrester could hack apart with their machete for food and hydration.
When Anna pours Lime juice for Forrester and he sits and drinks it from a clear glass, the liquid in the glass is clear also, but the pitcher of lime juice is bright green.
When Peck's co-pilot looks out at the starboard engine, it is leaking some kind of fluid, but that fluid is running down the side of the engine. It's not showing any sign of what would have to be, at least a 200 mph wind, passing over the nacelle.
The character Squadron Leader Bill Forrester, portrayed by Gregory Peck, takes both "dog tags" (military identify tags) from a corpse. One of the tags should have been left with the body. The tag retained on the corpse would be instrumental for identification at some future date by a graves registration unit. The tag that is removed and kept is to be delivered to the rear echelon; where it used to provide information to record the fatality.
The crashed plane has different radial engines to the engines shown when the Mosquito is flying. The crashed plane on the ground has radial engines, while the Mosquito has Rolls Royce Merlin engines, which were inline V 12s.
When the Avro Anson touches down on the dirt runway near the end of the film, it makes screeching sounds as per a hard surface.
During the plane descent just prior to the crash, Forrester tries unsuccessfully to radio the plane's position back to base. Later, while the survivors were still in the jungle, the Group Captain tells Anna that the plane crashed due to an engine fire. However, he had no way of knowing the cause of the crash-- they didn't even know for sure that the plane had crashed, only that it was missing.