The naming the black baby OJ and revealing it to a black talk show audience cracks me up.
Warninng: possible spoilers ahead....
I thought a lot of the movie failed. Mostly because the moviemakers seemed to want to advance their plot and stay on budget more than they were willing to keep looking for really good (and funny) examples of homophobia and general American lack of progressiveness.
For instance, I was very interested in the black talk show audience because I knew it was filmed just a few miles away from me. I thought that failed totally - the producers wanted to show the homophobia endemic in a black christian community, and instead, the people were fairly restrained considering what Bruno was throwing at them.
The Alabama redneck hunters: also very restrained (some of that was very funny, but not because the dudes were horrible example of American redneck-ism; they were actually pretty cool about the whole thing).
The stage parents were truly frightening though.