Not much to add. The film is filled with large, tightly packed crowds. The message is clear, that there is the crowd, and there is Hitler (with a few followers). As Rudoph Hess said, National Socialism is Germany, Hitler is National Socialism, Hitler is Germany, and Germany is Hitler.
He did not mention Jews once. He spoke of the future. One can see the appeal of control and authority in a nation which had known a great deal of chaos (much of which Hitler’s S.A. helped sow). Instead of blowing with the wind, he was going to plant “a pole” (Audience: Sieg Heil, Sieg Heil, Sieg Heil).
I think the Nazi anti-Semitism has to be seen, within their awful logic, not so much as hatred of Jews, but love of Germans. The Jews had to be “dealt with”, there had to be a Final Solution, because the protection of the German race and people necessitated it. Auschwitz was a proactive defense against the ruin of Germany.
And Hitler was obviously quite proud that his party represented an ideology. We have come, rightly, to detest and fear ideologues, but I think at the time it amounted to the creation of a socially needed secular religion.
Goebbels was definitely the most creepy guy in the film.
Hess struck me as goofy. I had not realized just how powerful he was. It was Hitler, then Goering, then Hess. It caused me to reread his story, the details of which I had forgotten: https://en.wikipedia.org/wiki/Rudolf_Hess
They kept Spandau Prison open for 20 years with him as the only prisoner. His was a very odd life, even by the standards of the time, and the group he belonged to.
I have often seen Leni Riefenstahl referred to as a genius, or master propagandist. I did not see this film as particularly brilliant, although I suppose I have to measure it by the standards of the time. They did end with a massive audience singing the Horst Wessel Lied. The whole thing felt like some combination of Oktoberfest and Church.