Around the Heinous mansion, portraits of Lucius in his original suit from the pilot◊ (which is brown-colored instead of black) can also be seen.
The Mysterious Mr. Ten has even more references to the concept art, with pictures of the pilot version of Heloise (who is essentially the same but with grayer, more dead-like skin) on Mr. Ten's wall.
Executive Meddling: The show was changed slightly from the original pitch before the final product was greenlit. However, a pilot was made containing many of the infamous original concepts, notably including Miseryville being explicitly stated as Hell, rather than just an implication. See What Could Have Been below.
Heloise would have been a Serial Killer that was either hit by the same bus as him or was shot in the head by the police (it's unclear which, though both were proposed concepts), and would have been arranged to torment Jimmy, only to fall in love with him.
Samy is a Starscream who would overthrow Lucius if he had the chance.
Also on Samy: "I don’t think of him as either gay or straight, just someone with a pathetically desperate need to feel needed and more important that he is. He’s a typical fascist – cowardly and obsequious to those above him, and a tyrant to those “below” him."