If you like Batman references and hate elevators, then this was the week for you. Welcome to “Watch the Arrowverse,” the weekly show where we take a look at some of the Easter eggs, important moments, and theories from all of CW’s DCTV superhero shows. On this episode, we’ll be looking at week 2 of “Supergirl”, “The Flash”, “Legends of Tomorrow” and “Arrow.” As we’ll be discussing the heroic details from all of those shows, we’re putting up the spoiler signal.