One thing you may not realize is that Elmo has a father. Another thing you might not know is that he dresses like a New Jersey goomba:
Yep, he has a little goatee, too. I know all of this only because I bought Griffin this book when he was 2. (“Elmo was dancing on the moon! But next time, Elmo wants Daddy to dance with Elmo!” “Sure, son. Whatever you say.”) Which, apparently, is such a cult rarity that even the keepers of the Muppet Wiki fail to mention it on Louie’s page.