Rewatching on Amazon.
Noticed some things.
1) A KGB agent in the 80's did an interview on how to change a countries thoughts from within. Basically, get this done, and it will take a generation to fix because no matter how much facts/logic you present, they won't accept it. See TDS, pro illegal aliens, etc.. examples. (this is a real interview). So, watching the show again, there are children who were born into the Nazi culture. Then you have the adults who even fought in the war accept and even embrase it. The creator of the show did a good job to show this.
2) There are only a few scenes with TV/comics. Juliana's mom is watching Sumo on TV. I guess baseball didn't become popular yet, or will ever. I mean, football or basketball could have been used, but it was sumo. Another scene where Franks coworkers dad was reading manga. No Superman comic book or Spiderman or Ziggy.
3) No 2A, especially in the Jap controlled territories. Early on, Frank had to make a gun and find bullets for it. Only Japs are allowed to buy bullets. Read deeper into what is being shown and 1 thing a conquering country must do is to take weapons away, so the people cannot fight.
4) Zero rights like due process.
So, whether the creator intentionally did these or not, it does add to the show if you know what's up.