Corrected entry: When in flight the jet-pack is always thrusting horizontally. There is no vertical component of thrust, and so there ought to be no lift supporting it & its wearer above the ground.
Corrected entry: If the propaganda reel with the rocket-clad German troops is made in Nazi Germany then why does it show the German invasion of the United States as malicious and barbaric? It makes Germany look very sinister. Shouldn't it show America as a threat and Germany as a saint? Isn't that what propaganda is all about?
Corrected entry: In real life, the flame discharged from the rocket would quickly set fire to the rocketeer's pants and boots.
Corrected entry: Neville Sinclair knocks out Jenny with a chloroform soaked rag - but this does not smudge her perfect crimson lipstick in the slightest.
Corrected entry: There is one scene where a flying machine makes a crash landing, and as it skids along the ground on its landing "roll," you can see the cable on the ground which is attached to a vehicle (unseen) pulling the machine along.
Corrected entry: When Sinclair summons his reinforcements, he yells: 'Sturmabteilung'. The term Sturmabteilung (roughly 'assault squad' in German) was reserved for the SA, which were - along with the Schutzstaffel (SS) - the two paramilitary organizations of the Nazi party. But in 1934, the SA was dissolved because of an alleged conspiracy. Commando troopers for this sort of mission would have been more likely picked from the Schutzstaffel, and certainly they wouldn't be called 'Sturmabteilung'.