Either team can score with walks, hbp, errors, etc. and have two no hitters in a normal 9 inning game. If the Cubs score in the 9th or earlier, Floyd can't get 27 outs. And if he doesn't get 27 outs, he doesn't get an official no hitter. Are you sure about that? Wikipedia says the game must be at least 9 innings, which it will be.