With the exception of Jill Eikenberry, all of the cast members from the original return for Arthur 2: On the Rocks. Cynthia Sikes replaces her. Eikenberry’s absence means she’s the only person who doesn’t embarrass herself. I’m sorry, did I say embarrass? I more meant humiliate. Worse, director Yorkin and screenwriter Andy Breckman don’t just…