NPR's guide to the running gags from the show.
George Sr. panics and attempts to flee.
10 episodes feature this joke:
George dons a wig to impersonate Oscar, and literally gets away from his doctors.
George Sr. escapes on the stair car.
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.