NPR's guide to the running gags from the show.
The characters catch a lucky break.
7 episodes feature this joke:
Lucille didn't kill Buster.
Maeby isn't found out.
George Sr. finds a Oscar unconscious.
G.O.B. and Michael get into prison.
Maeby finds a way to get the family to sign her release forms.
Buster destroys his neatly tailored Lucille replacement, and not Lucille herself.
George Michael: "I got kicked out of my dorm." G.O.B.: "That was a freebie."
Sources: Joke data compiled by Adam Cole / NPR. Episode metadata from The TVDB via a Creative Commons Attribution 3.0 United States (CC BY 3.0 US) license.