Anyone figured out what it does yet? Or do you think it doesn't really do anything in this episode (and will be useful in later episodes)?
At first I thought it might have something to do with the ending. My theory is that by giving the subpoena to Arthur McFly (which probably didn't happen in the original timeline) Marty changed the history completely - maybe Kid Tennan killed Arthur because of this in order to keep his mouth shut (kind of implied in the trailer for episode 2), which will then erase George and hence Marty from existence.
It would be cool if this is true and we see George disappears from the photograph in your inventory... just like what happened to Marty in the first movie. However at the moment I'm guessing it doesn't do anything for now and will be important in later episodes..
What do you guys think about the photograph?