The Brigadier General's stars are misplaced by the costumer, out near the end of the epaulet as worn by other officers, instead of centered on the epaulet as worn by Brigadier Generals in all branches of the service.
The other two officers shown are wearing the correct U.S. lapel insignia, however they are worn incorrectly. They have them worn the way the U.S. Army wears their U.S. insignia, the Air Force wears theirs with the US lapel insignia placed halfway up the seam, resting on but not over it. The bottom of the insignia is horizontal with the ground.
When Chappy uses the 'Super Booster' for his P-38 Lightning, the airspeed indicator goes over 600 miles per hour. It is impossible for the P-38 Lightning (or any other propeller aircraft, for that matter) to reach that speed.
The German Me-109s are actually-Me-109s built originally (in Spain) for the Spanish Air Force. They have Merlin engines instead of the original Daimler-Bnez engines. The Spanish designation was the HA-1112 Bouchon, not the US P-51B as previously reported.