Turnovers are close, edge 8-6 for the Celtics. 
OReb's are advantage Celtics 9-2. 
FTA are close, edge Cavs 12-10. 
3PTM are close, edge Celtics 14-13. 
So basically it comes down to the offensive rebounds favoring the Celtics and the Celtics shooting better from 2 at 12-21 (57%) vs 5-12 (42%) for the Cavs.