Rose Byrne is currently back treading the boards in Fallen Angels, a new revival of the Noël Coward comedy. Led by Byrne and Kelli O'Hara, the show relies heavily on physical comedy, which the actress spoke about during a visit to Late Night with Seth Meyers. "It's a technical feat every night," she said, explaining the verbal gymnastics of the language. The production came in the thick of awards season, when Byr…