Peter Pan Goes Wrong,” the happily hyperactive comedy that opened Wednesday night on Broadway, provides: missteps, mayhem, incapacitations, faulty sets and, in a roundabout way, “Fawlty Towers.”The very funny British play’s premise is the season’s simplest. The amateur Cornley Polytechnic Drama Society tries to put on “Peter and Wendy” and fails epically. 2 hours and five minutes, with one intermission. At the Ethel Barrymore Theatre, 243 W.