These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fridge Brilliance: The idea that Dr. Totenkopf, who has been dead for 20 years in the story, is being portrayed using re-cut archived footage of Laurence Olivier, who had died 15 years before the film is released. The idea of a dead man portraying a dead man just kinda seems to work.
Fridge Logic: A minor case, Joe refers to "World War One." At the time the film is set, the sequel hadn't broken out. It would have been called "The Great War."
Actually, World War One was being reffered to as such prior to the outbreak of World War II. As the Zeppelins seem to be headed by Germans but not Nazis, one might assume that in this universe, World War Two was a conflict not started by the invasion of Poland (although the East Asia war probably happened/is happening, given references to Tojou Hideki and Manchuria).