A lot of Cotton's dialogue sounds like the voice is right from the studio and that they didn't mix it properly (it is very echoey).
Tagline: "That's a good one, babycakes!" -Cotton
In the "leg room" there is a shelf full of the same hat, which is the mac one Dale wears all the time.
Cotton (mad at Hank for altering the eye test): We got ourselves a Benedict Arlen!
Luanne: Aunt Peggy, Uncle Hank... I just heard there was a Santa Claus exhibit at the Arlen Museum and someone stole his leg! (begins crying)
Cotton: Didi, my feet are cold. Knit me a blanket!
Cotton: First you gives back Panama, then you gives back the leg. Hell, if you had Ghandi's diapers you'de probably give them back too!
Cotton: I don't take no girlie gas. Did Lincoln ask for anesthetics when they blowed his head off?
The song played by John Redcorn in his car (although he is not seen, just the music heard) is "Hot Blooded" by Foreigner. This is the second time the song is heard, as it is also the song playing in "Pilot". The song in the flashback and when Didi wins over Cotton again is "Don't Sit Under the Apple Tree (With Anyone Else but Me)" by the Andrew Sisters. It is revealed in a later episode that Cotton loves the Andrew Sisters.
The announcer (over the final credits) is Mike Judge himself, speaking in his normal voice.
The story of giving Santa Ana's artificial leg back to Mexico is fictional; as the announcer explains over the closing credits, the leg is actually still kept in a Chicago museum.
Romeo and Juliet: Didi compares her and Cotton to Romeo and Juliet, who are lovers in the Shakespeare play with the same name.
The cereal box that Cotton's fake licence is made from is Cheerios. You can tell because it has CHEER on it. The name on his licence is also General Mills, which is the company that makes that cereal.
Tokyo Rose (alternative spelling Tokio Rose) was a generic name given by Allied forces in the South Pacific during World War II to any of approximately a dozen English-speaking female broadcasters of Japanese propaganda.
Benedict Arnold: After Hank changes the eye test so Cotton fails and cannot drive, he calls his son "Benedict Arlen," a play on "Benedict Arnold".
Benedict Arnold was a general for the Continental Army in the American War for Independence, but switched sides to support the British. His name is commonly associated with being a traitor.