Okay I saw the Nazi episode. They had me going at the start, I was getting mad at my DVR for taping the wrong episode, one of those stupid border wars shows...
Some unintentional humor with Hitler on Mt Rushmore and Goebbels instead of Google. And speaking of that, the internet-related segment was silly. A Nazi-occupied government would never create an internet with no centralized control. They might not create a communication system at all that's designed to let people talk with each other. If they did, it would be centrally controlled, heavily monitored, and therefore worse than useless for organizing a resistance.
The half hour format is frustrating because really they can only skim the surface of the topic. They make the assumption that Americans would "naturally" fight off the Nazi invaders sooner or later, but could the Nazis actually squelch loyalty to democracy within a generation, assuming there were no prominent examples of powerful democracies left to serve as inspiration, which there wouldn't be?
In that case, fascism would seem like the "natural victor" over democracy, which is too weak to survive. There would be a very different set of assumptions compared with the world we're all used to, where democracy has steadily expanded within the lifetimes of everyone alive today and we can see it still expanding on the news. What happens when people are seeing nothing but the opposite?
The saving grace for American freedom would probably be the non-Aryan segment of the population, who will have no choice but to fight, regardless of whether anyone on Earth still thinks democracy is possible. They'd fight just for survival.