Joe Walsh guest starred as himself in episode #2.14, "Drewstock", and had a recurring role as Ed in other episodes.
In this episode, during the jam at the end of the episode, as the camera is panning the crowd, you can see the guy who played the Devil in a previous episode.
The speech Oswald makes before the jam session at the end is almost word for word the same as made to concert goers at Woodstock, including Lewis saying that the party was the 10th largest city in Ohio (rather than New York at Woodstock).