Enid claims the Coon Chicken poster is supposed to represent how racism is whitewashed over in modern culture opposed to the more adamant and open racism of the poster's origins. The show she attends with Seymour works as an example of the phenomenon she speaks of. The "blues" band Blueshammer is comprised of obviously middle class white men singing about picking cotton all day long, which would definitely not be construed as overt racism but as whitewashed— especially given that in the same night, an actual blues musician who happens to be black is ignored by the same predominantly-white bar patrons. Also, the "blues" that the Blueshammer is playing is really more rock and roll fusion with blues type lyrics while the African American bluesman is trying to play authentic blues, which is just too deep for this audience who wants everything Theme Park Version.
When boarding the bus at the end, Enid is wearing conservative or more mature clothing. For her, this means anything that is not ironic, shock value, or wannabee punk. This could mean that only part of her is leaving for good. But which part?