-Fix up any problems with AI characters not doing what there supposed to do.
-For multiplayer, when you start to play the game you are put into the city (or area) imeadiatly and people join you instead of the host having to activate the game.
-Fix up rare issue with disappearing peds as in one veiw they are solid objects and another they are invisible.
-Fix up small bug with blood and vehicles as in when you run over a pedestrian, blood will appear to hover above the spot on the car instead of acturaly being on the car.
-Fix up problem when quiting multiplayer to single player and game crashing.
-Fix up issues with getting some acheivements on Xbox live.
I took these from the Bugs and glitches list.