Visual Effects Goof: The opening sequence is a computer generated visual effect showing a formation of US Boeing B-17G bombers being intercepted by a number of German Messerschmitt Bf-109 fighters. The Bf-109 version shown is the Bf-109E "Emil", as distinguished by the square wingtips and the struts supporting the tailplanes. The Emil was in widespread use in the early part of the war and was famous during the Battle of Britain. By 1944, they had all been withdrawn from service. The correct version for the period shown should be the B-109G "Gustav", which is distinguished by rounded wingtips, no tailplane support struts and a more streamlined nose profile.