Here's this series in a nutshell.
Game 5, Heat took 38 free throws, Celtics took 20.
Game 1, Heat took 14 more free throws than the Celtics.
Game 2, Heat took 14 more free throws than the Celtics.
How was the refereeing in Boston?
Game 3, Heat took 2 more free throws than Boston.
Game 4, (best reffed game of series) Celtics took 1 more free throw than the Heat.
Why such a huge disparity in games officiated in Miami? I'll let others decide that.