Season 3's Executive Producer, Eric Overmyer, wanted the Grand Palace in Denver to be like Rick's American Café in Casablanca - the central hub for the community, full of spies, remarkable for its faded grandeur.
The creative team behind "The Man in the High Castle" only used archival film clips that would've been accessible in the alternate timeline to craft Hawthorne Abendesen's "first film" of the allies winning the war.
George Lincoln Rockwell, here the Reichsmarchall for the American Reich, was in the reality time line the founder of the American Nazi Party in 1959. However, he served in the US Navy during World War II and was not a convert to Hitlerian ideas until well after the war. It is unclear how he rose to a position of such prominence in the High Castle time line, though presumably like John Smith he was co-opted soon after the Nazi conquest.
In the alternate history of TMITHC, the high school was previously named after Fritz Kuhn, former Reichsmarshall of North America, a fact that emphasizes the great impact Thomas Smith's story has had on the zeitgeist of the American Reich in Season 3.
The song "Tomorrow Belongs to Me", sung at Thomas's funeral ceremony, was not a Nazi song. It was composed for the Broadway musical "Cabaret" in 1966 by Kander and Ebb, two Jewish songwriters, an exquisite irony for a Nazi ceremony.
According to the TV series' alt-history, the Japanese government is made up of a Diet of elected representatives, the Judiciary (appointed by the legislative assembly), the Army and the Navy). Each branch answers to the Emperor.
In "The Man in The High Castle," the Sicherheitsdienst (SD) was the former intelligence wing of the SS in the 1930's. After the War, the SD became an independent agency, absorbing the Gestapo. Its real-world equivalent would be the Federal Bureau of Investigation, though, in the TV series, the agency bears many similarities to the Stasi. There is rivalry between the SS and the SD in the alternate timeline.
The SS is an elite intelligence force, described as the Nazi "Protection Squadron," responsible for national security, intelligence and State terror. John Smith was previously of rank Obergruppenführer, but a newspaper article notes that he was the first American promoted to the rank "Oberst-Gruppenführer". In the real world, only four people were given promotion to this rank, which was equivalent to the army rank of Generaloberst, and equivalent to a modern 4-star general. John Smith is the leader of the SS in the American Reich.
Production Designer Drew Boughton and Richard Heus, one of the executive producers of "The Man in the High Castle," had visited the Stasi prison in East Berlin while the first season of the series was filming. This visit inspired some of the production design for the prison scenes in Episode 301.
Bonus Content: This episode of "The Man In the High Castle" is one of a number of titles that benefit from exclusive videos and behind-the-scenes photos, accessible in the X-Ray Bonus tab in Prime Video.