As a Lakers fan, I'll say here what I said in Jeff's post-game thread. Do I think the officiating was totally level? No, not really - but not so terribly biased as to be an enormous surprise, given the huge level of home court advantage that pretty much every team has enjoyed throughout the playoffs. Just as I don't think the game would have been such a blowout for the majority of the second half if called more evenly, I also don't think the Lakers go on that huge run in the 4th if the teams are closer in score. Boston noticeably let up, and the Lakers just started bombing from 3 - both of these are unlikely events in a 10-point game as opposed to a 24-point game.
Do keep in mind that, a) it's likely to swing fairly far in the Lakers' favor at Staples, and b) the Celtics enjoyed a seventeen-to-three disparity in shooting foul calls. The latter point can't entirely be explained solely by home court and aggression, considering that the Celtics were one of the more commonly-whistled teams in the league all season (top 10 in fouls committed). Even so, I think this game goes to the Cs with or without some of the more questionable calls - it just likely would have been a game with less wild swings in the lead.