Here's how I look at it. The Celtics beat the Lakers senseless for most of the game. All else failing, the Lakers basically went to the basketball equivalent of scoring a touchdown, then going for an onside kick. They were successful at this, then repeated the process over and over again. This method worked, but it is by no means a high percentage plan of attack - it was desperation and it worked because they hit threes quickly and without missing all but a couple at the very end. Under normal circumstances - or over the course of a 48 minute game - this method would not have worked.
I don't know what to take from the game, except that the Celtics dominated the Lakers at their game, and almost lost still, due to a freakish string of shooting by the LA.