During a landing phase take note of the landing gear, front and rear... the fronts stay down, but the tail wheel retracts as they're seconds away from touching down.
After the bomb run and the plane starts the steep climb you can still see the bombs behind the co-pilot. You see them there again during the dive and once again after the pull up.
In B-17's the mechanism where the gunner in the top turret gun sat was clear visible and took up considerable room behind the pilots. Accordingly, the pilot entered the cockpit from a hatch built into the floor of the plane by their seats. In this movie the pilots board the plane as if there were the flight crew on an airliner. There is no top turret machinery visible behind the pilots even though the exterior shots show the top turret firing. So where is the top turret gunner?
During WW2, aviation fuel had no alcohol added to it. They raised the octane by adding TetraEthyl Lead, which is poisonous. While some fighter aircraft used alcohol injection, B-17's did not.
WW2 aviation gasoline was loaded with Tetra Ethyl Lead, which is poisonous. Anybody who drank that stuff for very long would be showing signs of lead poisoning pretty quickly.
The waist guns have no ammunition feeding into their weapons - there should be a flexible link-guide connected to the left side of the gun, just above where the barrel joins the body. I looked again after realizing that no cases or links were shown ejecting from the guns either.
The idea that you could distill alcohol out of a gasoline mix is dangerously false. The boiling point of any gasoline varies quite a bit, from 150-400 degrees F. Since Ethyl Alcohol boils around 170F, the chances of you being able to distill the alcohol out of gasoline cleanly without getting a LOT of gasoline in it are about zero.
When the bombardier is about to release bombs he beseeches the pilot to "hold it steady up there", when in fact he is in control of the airplane at that point.
The air raid sirens used in Axis cities were lower pitched than depicted in this film.
Numerous times throughout the film, characters are shown wearing flight jackets in what has been explained as sweltering desert heat.
The crewman caught stealing the liquor from the Officer's Club was threatened by a court martial under the Uniform Code of Military Justice (UCMJ). But the UCMJ was not in use till 1950 when all the armed forces were put under one justice system. Before then each service had their own military justice system; he would have been court marshaled under the Army 1921 Articles of War.
The M-5 steel helmets worn by some of the crew were only distributed Between June 1945-August 1945, they would have been wearing either the standard leather flying helmet or a field modified M-1 infantry helmet, the first dedicated aircrew steel helmet the M-3 was introduced in December 1943 and distributed until June 1945.
Near the first of the film, pilots execute a turn and sway outwardly, as if forces would pull one from the seat in that direction. Turns in an aircraft are taught to use enough rudder to offset centrifugal force, hence a "coordinated turn" would merely push the pilots straight down in their seat, and they would not sway to the side. This can be maintained, even on instruments to: "center the ball" by using rudder to the side that the ball is out of the index, as if "pushing it there" by using the foot that is on the same side.
When they are bombing Rome, the Roma Termini train station is visible. The terminal buildings were opened in 1950. Ther are also modern buses on the road.
The flight leader of the US Curtiss P-40 Warhawks escorting the B-17s wears the US Model 1944 pilots' goggles- in July, 1943.
Numerous times throughout the film, characters are shown wearing flight jackets in what has been explained as sweltering desert heat.