The only clear differentiation to me was when BSB1 ended when David was let go, and we had a long waiting period of watching David's back log of scenes until the roll-out of BSB2 with the first scene being Jimmy walking across the bridge on April 2, 2011, and we eventually learned that the new director was called Clay. There have been distinguishable incremental changes as time has gone by with new directors and locale, but there is no clear cut beginning or ending to me of any other versions of the site. It has been more like a gradual evolution. That's how I see it.