I just watched “Juno” for the upteenth time and I was struck again by its great narrative, especially by all the little touches that propel the story forward and keeps you engaged and hooked and invested. The “chapters” — season by season. It’s a natural propeller. She’s pregnant so we keep watching her get “pregnanter” and we want to know what happens 1. to her body 2. to the baby. She leaves that note on the couple’s doorstep so we’re not entirely sure if Vanessa will get the baby. And then, of course, there’s the outcome of Juno’s relationship with Bleeker. All in all lovely entertainment and a lovely narrative arc.