I'm intrigued. I've got family in Tuscaloosa in this period.
The trailer makes it little hard to piece out, but here's the Publisher's Weekly description of the novel on which the movie is based:
Phillips's debut packs atmospheric wallop as it conveys the simmering heat and playing-with-fire tension of the summer of 1972 in Tuscaloosa, Ala. Narrator Billy Mitchell, 22, loafs contentedly between shifts as groundskeeper at a mental institution. He's preoccupied with an old family mystery: he vaguely recalls that his mother and her maid, who were secretly lovers, died in a fire as they were fleeing Tuscaloosa years before. Now that he's been to college, Billy imagines that he can fathom such life-altering past events, but he's about to be brought rudely to reality--by suspicions of his father's role in his mother's death, by the psychiatric patient who is his girlfriend and by the maid's son Nigel, a young black man. Much of the drama hinges on Billy's inability to recognize how condescending his attitude is toward "lunatics" and toward Nigel, whom he insensitively views as a romanticized "motif" in the story of his mother's death. Given the year and the locale, Billy's naivete about race and individuality is not quite credible, but his self-centeredness rings absolutely true. Phillips often presents plot elements in the same dreamy soft-focus as the protagonist's reveries, but his ability to sustain an engaging, witty narrative voice bodes well for this promising young writer.
The documentary is the only one in that batch that I definitely want to see.