The Celtics lost because of:
Mosgov overpowered our bigs - and got away with a couple fouls
The two quick fouls called on Bradley in the 1st quarter
At the beginning of the 3rd quarter, the officials gave about 5-6 FT gifts to the Cavs
At the end of the 3rd quarter, the officials called a couple offensive fouls on the Celts, that were non calls.
That's all it took.
The NBA needs to remember that people like march madness because of Cinderella stories.