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.
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.