In long shots the B25 bombers each have a machine-gun mounted in the nose. In interior shots of the cockpit it is missing.
When Marion Scheisskopf (Julie Ann Emery) is laying on the bed face down nude after sex, in one camera angle she isn't covered, but in another angle the sheet covers her bottom.
The aircraft throughout the series are shown flying through 'flak' (anti-aircraft fire). The effective range of most flak at the time was about 30 yards (a sphere of 60 yards diameter), and even a burst around 200 yards away could cause significant damage. However, such explosions within a few feet and even in front and directly in the path of the planes appear to cause little or no damage.