When Ed Harris' character jumps out of the plane, he's wearing a green uniform. The camera cuts to a long shot of him descending with his parachute open. In that shot, the parachutist is wearing a white winter uniform.
The static jump line Ed is attached to when he parachutes out of the plane never goes taut and is flapping around loosely so it could not have deployed his parachute.
Captain parachuted into France on May 7 yet there is mature corn in the field.
The aircraft in which the hero escapes from occupied France during WWII is a Holste MH1521 Broussard, a type which first flew in 1952.