Anyone who has walked by a Broadway theater’s stage door after a show will immediately recognize the central characters of Ana Nogueira’s Which Way to the Stage. They are the ones clutching a copy of Playbill (usually protected in plastic) in one hand and waving a Sharpie in the other. As they wait for autographs, they fervently debate the most pressing issues of the day, such as who should play Mame in the next Broadway revival; which Glinda in Wicked even comes close to Kristin Chenoweth’s performance; and, for heaven’s sake, will Rob Marshall ever make Follies into a movie?