When Major Egan's date is leaving, she puts on both shoes onto bare feet but is wearing dark stockings as she leaves the room.
Fliers dance to Glenn Miller's "In the Mood"; the song was not released until 1944.
The Red Cross was giving donuts for free. They started charging for donuts in 1942. Later acknowledged to be an error of judgment on their part.
When Bucky phones RAF Thorpe Abbotts, he asks for 'Norfolk 7322'. Norfolk is too large an area; he would have asked for the local exchange, which was Hoxne. He would have had to dial 0 to get to the operator; after the call was picked up, the operator would tell him to insert the right coins and press Button A.
As the B-17 is taking off after being repaired whilst taxiing, the runway shows modern markings denoting the runway's displaced threshold.
When the resistance collects Sergeant Quinn and his colleague from a Belgian farm, there is a field of round hay bales. Round balers were first used in 1971.