http://i.imgur.com/6W5InkH.jpg
That image is only on screen for like 2 seconds, but it tells a whole story and really pulled me into the film. The first half you're deep in the city, and then finally when you get to see it from afar, it seems like a whole real city instead of the few locales they shot. Also makes it feel like a continuity of our future instead of some random alien drama.