American Pie 2 brings the whole cast back as college freshmen off on a summer lark, but something is lost, besides Paul Weitz as director (J.B. Rogers fills in): a sense of innocence behind the raunch that made the 1999 original memorably good fun. This time we just get the crudeness. A guy pees off a balcony, and Stifler (Seann William Scott), thinking it’s champagne, laps it up. Michelle (Alyson Hannigan) shoves a trumpet up the ass of Jim (Jason Biggs) that her teacher puts in his mouth and plays. Most of the cast, especially Pie girls Tara Reid, Mena Suvari and Shannon Elizabeth, mope around like actors who know they’re getting too old for this. They are. So are audiences, who have OD’d on gross-outs and deserve more than a slipshod sequel that looks tossed together over a weekend by people who couldn’t care less.