From his prison cell, Charles Manson recites NBC's 1997 slogan, "If I haven't seen it, it's new to me!"
The TV has antennas on it, but they use cable. Seth MacFarlane explains in the DVD commentary that this helps distinguish the TV from a microwave.
During the Scooby Doo cutaway, the gang's van is titled "The Murder Machine" instead of "The Mystery Machine."
During the Bavarian festival, a German bratwurst vendor reminiscent of Adolf Hitler uses a sausage to hit a Polish Sausage vendor, and then takes over the stand, replacing the name with "German Sausage." He then eyes a Czech Wiener vendor as well. This is a reference to early events in World War II in which Germany overran Poland and Czechoslovakia.
For the first months of production, the writers shared one office lent to them by the King of the Hill (1997) production crew.