For everyone saying that the refs don't matter or don't control the flow of the game:
10 of the 16 fouls called on the celtics came AFTER they were up by 13. Conversely, in the same span they called 0 fouls on the cavs.
So when the calls were 6-4, the celtics were up 13. Suddenly, 10 straight fouls for the cavs and the game is close again.