The BKLYN stage door is literally right out front of the Plymouth, and to the left. You can't miss it after the show, seriously. Just look for throngs of Eden-worshippers:) It's a fun time, though.
And even if the stage doors aren't right there, it takes about two seconds to ask an usher and they'll tell you.
"There's a butt naked princess, lounging in a bed, calling your name. What exactly didn't you realize? Before our wedding night, pack up some of that dried monkey meat and have the royal cartographer draw you a map of the female body, captain. Maybe then you'll be more inclined to come explore!"