The biggest clarification was that cards are always played in front of the player playing them even if they are strengthening someone else's conspiracy. This is not directly stated in earlier rule books (though it should be clear after reading the rulebook).
Wow, that's a HUGE change! And no, the latest (v3.3) iteration of the rules didn't really make that clear.
I don't want to be overly critical, but your rules could really use some tightening. There are several elements that aren't immediately obvious and can only be discerned through inference instead of being explicitly stated (the situation described above being a good case in point). I've learned through personal experience as a designer/developer for VPG that if you don't spell something out in great detail it's an almost sure-fire guarantee that someone will misinterpret your intent.