NPR's guide to the running gags from the show.
Lindsay's fashion lacks subtlety.
4 episodes feature this joke:
Lupe's daughter wears Lindsay's SLUT shirt while impersonating her at a rehab clinic.
Related Joke: Lupe's hand-me-downs
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.