One of the jokes that Eddie tells Frank is the same joke that Earl tells Randy in my name is Earl.
Eddie is seen telling the punch line of a joke: "We call ourselves the Aristocrats!" That is from an infamous joke among comedians, which is much more about the setup - everybody has their own version - than about the punch line itself. There's even a documentary about the joke, The Aristocrats (2005), which features a lot of famous comedians, telling the joke or talking about it.