Have we ever heard about modified rules?although FIFA have their rules for Football different leagues/association incorperate different modifications to suit their situation,this happens in the US all the time, every where you play it's something different,this could have been the case here,it isn't a surprise to me is just that it's rear this happens.
Having said that,i know of the coin toss rule but can't remember exactly when or how it comes into play,could someone do some research on that(Tallman),i don't know also if it is still used with the changes FIFA makes every year,this is a good one might be educational for all on here.