Lurlene Lumpkin (the country singer Homer represented) and Ruth Powers (Marge's old friend) can be seen among the women standing outside Kirk's jail cell.
The marching band in Wiggum's parade resemble the band from 'It's a Mad, Mad, Mad, Mad Marge' (episode 21, season 11) with orange uniforms and tall blue hats.
The title is a reference to "gangsta rap".