The Celtics won this game because Rondo, Garnett and Davis went 19-25 their shots out of 10ft. That's an efficiency above 75% in long 2s.
If it wasn't for that, it would have been another lackluster performance, very similar to the past ones. Similar in the boards, similar inability to get high percentage shots, similar shot-selection, similar defense. Even a heavily perimeter oriented team like this season Spurs beat them in points in the paint.
Anyone who expects similar performances in the playoffs is going to be sorely disappointed because there's no way such efficiency in long 2s is sustainable.
OP is seeing things that didn't happen and only wrote this post because of the final score. Had they been normal in those long jumpers and lost another game this thread wouldn't exist.