Possible goof?
Soon after the start of the film when Stachel climbs on board the truck with the other pilots to go to their quarters, you can hear the pilots singing a song that starts off with "There was a girl from Poland...".
Um, Poland had no existed as a country since the Third Partition in 1795 and it did not exist again until after WWI. Maybe this song they were singing pre-dated 1795?