Goofs

Reconnaissance flights are often shown with a P-51D taking off but a P-51B in flight. Due to their radically altered canopy configurations, these two types are plainly different.

The B17 Picadilly Lilly is an "F" model, yet throughout the series, combat footage of "G" model B17s are cut into the scenes. The main difference between the models is that the G models feature a "chin" turret under the nose of the plane.

During his first appearance in Season 2, General Britt (Andrew Duggan) explains to Joe Gallagher that he lost his right leg when he was shot down and crashed in No Man's Land in World War I and never flew again after that. But in later episodes, Britt and Harvey Stovall are shown reminiscing about having flown together in the years between the World Wars.

In many scenes through the series crew members are shown smoking on or near aircraft. Smoking was never allowed anywhere near aircraft or ammo by the Army Air Corps since day one. It was especially prohibited in the days when aviation fuel was 100 octane gasoline which was then used by prop-driven aircraft like the B-17.

Nearly all episodes showing ME109s firing are actually an American P47

During his first appearance in Season 2, General Britt (Andrew Duggan) explains to Joe Gallagher that he lost his right leg when he was shot down and crashed in No Man's Land in World War I and never flew again after that. If that were the case, Britt would have never been able to accumulate the number of flying hours or years of rated flying service to be wearing Command Pilot wings which he does, and it would have likely precluded a career in the Army Air Corps/Army Air Forces that would have advanced him to general officer rank.

Throughout the series, a number of characters bail out over German-held territory, are rescued by the French Underground and returned back across the English Channel to Archbury and combat with the 918th in a matter of a day or so. Actual returns of Allied aircrews rescued by the French Underground normally took several months, especially before the D-Day invasion (which takes place at the beginning of Season 3); also such aircrews were almost never returned to combat in the European Theater, but reassigned to another theater or back the the Continental US because they knew too much about the Underground operations and would risk compromising that information if subsequently captured by the Germans.

Throughout the series, actors regularly smoked king-sized filter cigarettes, which didn't exist in WWII.

WWII B-17 crews uniform with 50-star USA flags.

Nearly all of the women featured through the run of the series had 60s hair styles and not the 40s hair styles that would have been prevalent during WW II.

The black plastic eyeglass frames worn by Major Stovall, known variously as "Buddy Holly glasses", "nerd glasses" or "birth control glasses (BCGs)", did not come into existence until after World War II. The standard GI glass frames during the war were the wire-rimmed frames worn in the movie version Twelve O'Clock High (1949) by Dean Jagger, who played Stovall.