In Philip K. Dick's book, Juliana Crain visits a Denver that seems to function like a regular American city. In the TV series, the creative team imagined a more run-down, impoverished and dangerous version of the Zone, partly to explain why everyone doesn't go there to escape the rule of the Axis powers.
It's significant that the film of the Allies winning the Second World War shows footage of Winston Churchill and Franklin Roosevelt; in the alt-timeline both Roosevelt and Churchill were assassinated - Roosevelt in 1933, Churchill in 1940.
Philip K. Dick began work on a sequel that further explores the Nazi plot to break into and colonize alternate worlds with the Nebenwelt machine, however the narrative was never completed.
Culturally, the Japanese see white Americans as a 'surrendered' and therefore 'shamed' race. They are beneath contempt.
Nazi psychiatry is referred to as "Jungian therapy" after concepts developed by Carl Gustav Jung. Jung was a contemporary and admirer of Sigmund Freud but later disagreed with the Freudian theory, which the Nazis dismissed as "Jewish science". However, Jung himself rejected Nazism.