We have two big sequels this week on Movie B.S. with Bayer and Snider. “The Hangover Part II” is a pretty close copy of the first film, with somewhat diminishing returns. “Kung Fu Panda 2,” on the other hand, is a worthy follow-up, with a good story and everything. Then we have a guest: “Saturday Night Live” writer Bryan Tucker, who’s been with the show six years and has plenty of inside scoop about how “SNL” comes into existence every week.