One of the teenage girls that Kenny finds wears a DVDA shirt. D.V.D.A. is the name of the band which Trey Parker and Matt Stone are a part of. It is also a slang sexual term meaning Double Vaginal Double Anal, an act involving a woman inserting two penises into her vagina, and two into her anus, at the same time and is even mentioned in Parker and Stone's film Orgazmo (1997).
This episode marks the only time Cartman ever says, "Oh my god, they killed Kenny!".
This episode marks the first time Butters Stotch speaks. His voice, however, sounds very different from his modern Southern accent and a lot more like Clyde's or Craig's.