When the German officer is speaking to the French waiter in the bistro about jewels, the oyster he is holding and about to eat is held the wrong way around. Camera cuts and suddenly oyster is held correctly as the German eats it.
When B-24 Liberator bombers are shown opening their bomb bay doors, they open in the same manner as the B-17 "clamshell" type. Actually, B-24's had a double bomb bay whose 4 doors rolled up the sides like a segmented garage door or roll-top desk.
In the opening sequence, B-24 bombers are shown bombing the city. The view under the plane shows the bomb bay doors opening but they are hinged, similar to those on a B-17. On the B-24, the bomb bay doors slid up the side of the fuselage when opening.
In the opening scene, the bomb bay doors of the B-24 Liberators open outward like those of the B-17, when in reality they are louvred, and roll up tracks on the sides of the fuselage in order to reduce drag on the aircraft when dropping its payload.
The series completely ignores how a low-powered civilian radio transmitter could have broken through radio interference in WWII German territory.