Trivia: At the dinner ceremony where Spawn attacks Wynn and kills Church, you can see a red-headed woman in a blue gown walking among the patrons in the beginning of the scene. The camera focuses on her briefly, but for a reason - look at her earrings. They are Spawn insignia. This is a reference to the angel Hellspawn hunter Angela, who wears those same insignia in the comics as trophies of her victories over previous Hellspawn. Very clever reference.
Trivia: As already noted, Hercules wears a lionskin which is made out of Scar. In the myths of Hercules one of his great tasks was to kill a vicious lions and he kept the skin ever since. But it's more than just a joke or a cameo that he wears Scar, for both Scar and Hercules were animated by the same man (Andreas Deja).
Trivia: This movie features three horror stars. Beaumont is played by Robert Englund (Freddy Krueger), Johnny Valentine is played by Tony Todd (the Candyman), and the guard at the auction house is played by Kane Hodder, the man behind the mask as Jason Voorhees in several consecutive Friday the 13th films.
Trivia: The box that holds all the captured chess pieces shows Pixar Studios' old address, or the address they had at the time of this film.