well besides the honeyed spielbergian ending,
if precrime works, all predictions have a minority report, no?
haha: the rolling ball example for cause and obvious effect, how do you know that keanu reeves is not going to stop the ball or if a cat will jump in and bite it, or that the fbi guy will actually catch the ball?
("I knew you'd've stopped it"
"Wow PreCrime intuition??"
"no it sounds really irritating rolling on the glass surface...")