My memory is a bit fuzzy, but there's one moment, early-ish (after they leave the convenience store), when the 4 of them are running in one direction, and they run by another group of ~4 running in the other direction. I wasn't positive, but it looked like one of the people in that other group had a video camera in their hand.
It reminded me of the scene in Shaun of the Dead when they run into the group that is a mirror image of their own.
I even thought to myself at the time "I bet if there's ever a sequel, it'll take place on the same night and we'll see glimpses of the original cast."