Trivia: The Grinch's face is partly based on Chuck Jones' own face. Jones said he tended to sneak his face in without even realizing it. (Source: NPR).
Trivia: Fred Gwynne (Herman Munster) and Al Lewis (Grandpa/Count Dracula) worked together previously on "Car 54, Where Are You?" This is referenced playfully after Herman and Grandpa discover the secret of Munster Hall.