When Joy shows her 'baby bump' and says 'i even got Lars' signature, that really is Lars Ulrich's signature. He agreed to sign it, as he's a big fan of the show, and loves the fact that Earl quite often wears Metallica t-shirts.
Juliette Lewis is the real life sister in law to Ethan Suplee. He is married to her sister Brandy.
The first episode where Earl does not complete even one item from his list. He attempts to, but is relieved of it by Joy, who took responsibility for the item in question, and subsequently crossed it off of Earl's list herself. ("Ditched Jesse and Married Joy").
The Instrumental song at the very end after "Kung Fu Fighting" is "Night of the Slunk" by guitarist Buckethead.
Joy and Darnell watch Wonderbug (1976) This, like Sigmund and the Sea Monsters (1973) and H.R. Pufnstuf (1969) was a Sid and Marty Krofft show.