Example...I live in the area where a lot of the LG videos are filmed. In fact, I live right down the street from Cabarello Canyon, where the Thanksgiving vid was shot. It is conceivable that I could stumble upon them...or the actors at some point. In character or not. I stumble upon plenty of other stuff around here, that's for sure.
What if I happened to catch the watchers watching? What if someone slipped me a tip of when they would be filming?
Would I then become part of the story, too? Or just an off shoot of fandom?
Granted, that would probably make me totally psycho.

Of course, I don't even own a video camera, so it's not something I would do...just hypothesizing about all the new story branches shooting up.