Factual error: The sea plane that lands to rescue Savage at the end is a type not built until after the war. And it's marked "U.S. Air Force," an entity that also didn't exist until after the war. During WWII, what later became the Air Force was known as the U.S. Army Air Corps.
Continuity mistake: Gallagher looks out at his wrecked B17 from the ruins, and the aircraft's tail section is facing the camera. Several minutes later, he looks again from the same vantage point, and the burning plane's nose and engines are now facing the camera. (00:11:35)
Continuity mistake: While Savage struggles with Kemp in the cockpit, the bomber goes into a nosedive. The next shot is stock footage that shows several people jumping from the plane and deploying parachutes. But when we cut back to the interior set, no one in Savage's crew has bailed. (00:42:00)