Somebody in the production company for the CBS special "Yes, Virginia" really bleeped up when it came to the credits for the actors. The role of "Scraggly Santa" was attributed to Steve Buscemi in the end credit sequence; but the role was played by his brother Michael.
In the past, Toobworld Central has taken the position that credits have no effect on a TV show; it's what is stated in the actual program that matters most. And in this case, there's even less concern since there is no connection between the characters of Toobworld (or in this case, the Tooniverse) and the actors who play them in the real world.
Still and all, that must have put Michael Buscemi on the phone to his agent as soon as he saw it!