Michael Frayn’s Noises Off takes a fond look at the follies of theatre folk, whose susceptibility to out-of-control egos, memory loss, and passionate affairs turn every performance into a high-risk adventure. This play-within-a-play captures a touring theatre troupe’s production of Nothing On in three stages: dress rehearsal, the opening performance, and a performance towards the end of a debilitating run.  Frayne gives us a window into the inner workings of theatre behind t…