There are two different arguments here, I think.
The first is "Did the officials miss/blow calls?" I think the answer to that is probably yes. I thought there were some inconsistencies in the way certain issues were handled -- some plays that were fairly similar to each other that were called differently for no immediately apparent reason. I think it's fair to criticize officials who make bad calls or blow obvious calls or who are inconsistent in the way that they call a game.
BUT
I don't think that answers the second question, which is "Did the officiating affect the outcome of the game?" My answer to that is always No. Teams don't lose games because of bad officiating. Teams lose games because they fail to do the things that must be done to win, regardless of the officiating. In some cir stances, it might be more difficult to accomplish those things, but the opportunity to win the game always lies with the players. It's a pansy way out to and moan about officiating or about getting "bad breaks," as D'Antoni euphamistically puts it. Teams win an lose basketball games -- and particularly, playoff basketball games -- based on their ability to overcome adversity and continue doing the fundamental things that are required to win. The Spurs didn't do those things in the 4th quarter of Game 4. The officials didn't stop the Spurs from rebounding the ball better. The officials didn't force the Spurs to travel, or to throw bad passes. The officials didn't cause the Spurs' offense to go stagnant and the Spurs' defense to go soft. The Spurs had control of all of those things -- and the Spurs themselves failed to do what was necessary to win the game. That's the bottom line and the only relevant question, as far as I'm concerned. Officials will always miss calls -- they do it in every single game. Players must ignore the officiating and just play the damned game.
If you want to win, play better.