The police officer that shows up at the bonfire is really the warm-up comedian who warms up the live audience prior to recording, as well as between sets.
Jeff and Josh make a joke about telling people they are brothers. The actors (Barry Williams and Christopher Knight) are famous for playing two of the three Brady brothers in The Brady Bunch (1969).
According to the show's official website, Point Place is a fictional suburb of Green Bay, Wisconsin. Yet, evidence on the show itself suggests that it is across the state, near Kenosha. For example, in earlier episodes, the gang visited a new disco in Kenosha and Midge Pinciotti took a class at "Kenosha Community College".
Barry Williams and Christopher Knight are the second and third "The Brady Bunch" actors to appear in the series, the other being Eve Plumb in season one.
In the scene where Kelly and Fez are making out, they're sitting in an early '90s model Volkswagen Cabriolet.