All of the humans have 5 fingers except Jared, who has 4.
In an interview, creator Christy Karacas said influences for the show include Tex Avery, Chuck Jones, child art, Bob Clampett, John Kricfalusi, Vince Collins ("Malice in Wonderland"), Sally Cruikshank, Tom Ruegger, Fleischer Studios, Walt Disney, Ripley's Believe It or Not!, Monty Python, The Itchy & Scratchy Show (segments from the Simpsons), Beavis and Butt-Head, Hanna-Barbera, Ralph Bakshi, Looney Tunes, Mad, Sesame Street, The Muppets, Yellow Submarine, outsider art, Pee-wee's Playhouse, Schoolhouse Rock!, Earthworm Jim, Dr. Seuss, and underground comix (including Gary Panter, Robert Crumb, and Mike Diana).
The Warden's real name is yet to be revealed. In an interview David Wain said that he knows it but can't tell anyone or he'll be fired.
In an interview with "FreakSugar", show producer Christy Karacas confirmed that the Warden was a romantic asexual.
In a 2018 Reddit AMA promoting the movie "A Futile and Stupid Gesture", David Wain confirmed that the Warden's name was Mark Davis.