I found a way to get out of the map on one of the campaign levels that actually helps you a lot. You eventually need to go back and get the checkpoint but if you have two people one in the end part and one right before the checkpoint you have a huge vantage. It's a simple glitch really but I am not going to go into detail until I have a filmer. Also Ive found out that the Banzi Buddies preload through the level. (lol Banzi Buddies). but yea hit me up on xbl my gt is my name. Hopefully i dont get hit by the ban wave.