You've probably heard how all three original stars dropped out of the Metropolitan Opera's new "Tosca" and how the conductor had to be replaced twice. But did you know about the flap over the angel's wings? A replica of the bronze statue of Archangel Michael that stands on the roof of Rome's Castel Sant'Angelo sword in hand was supposed to dominate designer John MacFarlane's third-act set for Puccini's melodrama.