Wiz 'n' Liz Trivia
In the mini-game Splat Those Dudes!, you can see Puggsy from the Psygnosis game by the same name. If you hit him, the message "Puggsy!" is displayed.
Another cameo appears in the game, this time on the Sega logo when booting up the game. It's the main character from Bizarre Creations' (back then known as Raising Hell Productions) previous game, The Killing Game Show (also known as Fatal Rewind)