actually i think that has already been adressed in this forum....in a simpson's special hosted by Troy McClure, he says the register says NRA4EVER, but if you watch the intros carefully (taped & play in slo-mo), it actually says nothing but random numbers. Give it a try.
And Magruter, the Beer Baron is easy, its Homer J himself. As for his nemesis, I can't remember his last name but for sure, his first name is Rex.