When Curtis is slapping Forbes about, he forcibly throws him into a wall section, which at first glance appears to be largely undamaged. When we cut away and back the wall has a gaping hole in the corner and a massive crack running down it.
Near the end, when they are in the office looking for the override device, a guy with a pink shirt passes two times behind Jack. They used the same shots to keep the suspense, but because it should be in real time...