One of the transitional elements of the show, used to bridge two scenes together, contains a sound bite of a man saying "Look out!" The man is O.J. Simpson, and comes from a interview Simpson gave to Howard Stern on Stern's radio show, before Simpson's well-documented legal troubles.
The number in the commercials (1-877-MANBIRD) is a real number, and you get an automated answering service provided by Potamus.
"Gigi", Harvey (and Phil's) wife on the show, is a play on "G.G.", short for Galaxy Girl, her original character in Birdman and the Galaxy Trio.
In the Shoyu Weenie episode, Seiko speaks Japanese to the crowd. She says, "It's pretty, I think. I'm Seiko. What is your name?"