I haven't seen the miniseries yet because I do not get HBO - I'll have to wait for the DVDs.
In the meantime, let me direct you to several excellent commentaries on the subject:
Boston 1775 has an ongoing series of commentaries.
Slate addresses the actors' anachronistic teeth.
Jill Lepore reviews the miniseries for The New Yorker.
I am especially appreciative of Boston 1775's piece, "What John and Abigail Really Saw" because it points out that John Adams was really at Henderson Inches' house on the night of the Boston Massacre. I have a particular stake in this bit of trivia because Henderson Inches had married Sally Jackson (the subject of my undergrad thesis) on February 22, 1770, and John Adams' presence at their house helped me piece together the chronology for my thesis.