From the beginning of Hitler's political career, he always had one or two companions with him at all times who could act as bodyguards. When Hitler came closer to gaining power, his security was increased. He had at least 8 personal security guards selected from the SS who were always stationed nearby.
Hitler overcame his fear of being poisoned by employing a group of 15 young women to taste his food, under armed guard, before it was served to him.
Hitler supposedly loved movies and watched one every night after dinner. The Nazis took control of the film industry in Germany and imposed strict censorship on any foreign films that were not in line with Nazi ideals. The Nazis, namely Goebbels, who headed the Ministry of Public Enlightenment and Propaganda, used films and newsreels frequently to manipulate the public.
It is also believed that Hitler demanded the executions of those who tried to assassinate him in 1944 to be filmed.
The "Führerhauptquartier in the Austrian Alps" is actually Hohenwerfen Castle near Salzburg, Austria. It was used as a location for a Nazi stronghold before in the 1968 movie Where Eagles Dare starring Clint Eastwood.
Hitler's wardrobe for "The Man in the High Castle" came to life through the imagining of evolution. Much thought was put into what Hitler would have been wearing in his private quarters in 1962. Hitler would often be seen in more modest attire with less decoration than the advisers that surrounded him. The Costume Department imagined that, out of the public eye, he would dress even more simply - donning a double-breasted suit with only the iron eagle tie pin decorating him.
Rudolph Wegener's son, Otto, is reading "Ranger Reich" magazine. This may be a reference to real-life magazine "Ranger Rick." While the magazine was not published until 1967, Adolf Hitler played a role in the establishment of the first environmental protection laws in history, possibly accelerating the timing.