Frisky Dingo reference
To anyone who was a fan of Frisky Dingo, a show made by the creator of Archer, there's a great random C.H.U.D. reference in season 1 as Killface and Xander Crews wander the sewers.
Killface: "Did you hear that?"
Xander: *gasp* "Maybe it's the C.H.U.D.!"
Very random, very funny.