First, the NBA game is the hardest game to officiate in the world, bar none.
Second, the officials in general do a horrible job of enforcing the rules, in my opinion. The game has gotten to the point where every foul and violation is a judgement call by the officials, when the rules clearly state otherwise.
Third, as I look at the series as a whole, I don't think the officiating has been biased one way or another. Each team has had games where they caught more breaks than the other. Poorly officiated, yes. One sided, no.