Surprised that no one has mentioned that the players/teams should be on the middle line, but at opposite sides of the pitch. It makes for nice drama to have them slag eachother off but the way it played out between for example Argentina and the Netherlands... well, for shame. Players about to take a penalty and the goalies should not be allowed to be spoken or gestured to by opposite players either. There should be only two possible touches of the ball after the penalty taker puts it on the spot: the shot and possibly the save. At any other moment, the ball is considered to be held by the ref. Any other deliberate attempt to touch the ball should yield a yellow.
In general: stop messing about ^^