These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Acceptable Targets: White Southern Americans—and, by association, white Americans in general. They're all racist, they have no culture (and wouldn't be able to develop any without black people), and also they're pure evil.
Ear Worm: Senator Fauntroy's campaign jingle. Specifically, the longer version that runs over the credits.
Also, the theme to Runaway, a parody of Cops—which, in an even more entertaining/dastardly nod, sounds suspiciously like "Bad Boys" (the Real Song Theme Tune to Cops), but done by a bluegrass band as opposed to a black reggae group.
The purpose of the mockumentary is to discuss the issue of racism from a new angle. Unfortunately, that purpose is lost on the people (both American and non-American) who applaud the documentary for "exposing the real United States as the Evil Empire that it truly is."
Older Than They Think: Yes, the word "Aryan" (when used to describe a person of Northern European ancestry) did exist before the Nazis got their mitts on it. In fact, it is used in precisely this context in D. W. Griffith's The Birth of a Nation, which The Hunt for Dishonest Abe is an obvious Captain Ersatz for.
Tear Jerker: As much of a racist Jerkass Fauntroy is, you can't help but feel a little sorry for him as he discusses the pain he felt when his father was assassinated by JBUnote John Brown Underground operatives.