This happens in the first scene of the movie, the convenience store robbery.

After Old Dog has shot the man behind the counter, he grabs the woman who also works in the store and is takes her to the back room to retrieve the surveillance camera tape. As he is pushing her to the back room, watch the round anti-shop lifting mirror and the mirror over the beer cooler...you see the entire film crew following all of the action, clear as day. On the DVD, this is especially clear.