At Thorpe Abbotts in "May" of 1945, the trees in the background are either bare of leaves or showing yellow and red autumn colors. One exception to this is when Rosie comes out of the officers club, and all the trees behind him are correctly sporting bright green leaves.
Late in the war, newer B-17s were the G-variant with a front-mounted, twin-gun turret below the nosecone. In the final episodes, newer B-17s are shown (they are silver colored), but they are still the F-variants with the single machine gun in the front nosecone.
The dropping was at Valkenburg near Leiden, but the sequence shows the bombers overflying the windmills at Kinderdijk, which would not have been on the route actually flown.
In episode 9, the crews are said to be making a food drop on Valkenburg in the Netherlands, an area said to be under German occupation in May 1945.
In reality, Valkenburg, which is near the Belgian border, was liberated in September 1944 and would have had no need for air drops of food.
It was the area far more to the north around Amsterdam that had not yet been liberated from German occupation in May 1945.
The flag flying at the last prison compound appears to to be Kriegsmarine. It was obviously not a naval base, nor was it staffed by naval personnel. The flag in question was also the war flag for the Wehrmacht, as well as the naval ensign, so it's use at the prison camp is not entirely unbelievable.
When the POW camp is being attacked by incoming US troops, a German camp guard opens fire on the advancing troops with what appears to be a semi-automatic Karabiner 98k rifle. In reality the Karabiner 98k was a bolt-action rifle and thus was not capable of semi-automatic fire.
Tempelhof Airport in Berlin, the airfield target in the opening sequence, is shown having two concrete runways. It was a grass airfield until 1948, where during the Berlin Airlift the two runways were built by U.S. engineers.