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The "another" implies that they had watched other Hitler documentaries - the most famous being Leni Riefenstahl's [http://en.wikipedia.org/wiki/Triumph_of_the_will ''Triumph of the Will'']. The description of the Nixon rally that Doc is watching has similarities to ''Triumph''. Note that [http://en.wikipedia.org/wiki/Triumph_of_the_will ''Triumph of the Will''] was a favorite film of [http://en.wikipedia.org/wiki/G._Gordon_Liddy G. Gordon Liddy], a man responsible for the erruption of "Cop" shows on TV and the emergent "War on Drugs" in the early 70's.