Since 2008, the Spurs are 3-5 in playoff games officiated by Joey Crawford:
2008 WCFR, Game 5 v. Phoenix -- WIN
2008 WCSF, Game 5 at New Orleans -- LOSS
2008 WCF, Game 4 v. LAL -- LOSS
2009 WCFR, Game 3 at Dallas -- LOSS
2010 WCSF, Game 2 at Phoenix -- LOSS
2012 WCSF, Game 4 at LAC -- WIN
2012 WCF, Game 1 v. OKC -- WIN
2012 WCF, Game 6 at OKC -- LOSS
Of course, the Spurs are 27-26 (and only 24-21 in games that Joey didn't call) in all playoff games since the start of the 2008 playoffs, so the outcomes in Joey's games are pretty close to the average, actually -- and all of that is helped by the e of last year's playoffs.
For whatever it's worth, the Spurs are also 15-10 in regular season games with Joey since the start of the 2007-08 regular season (and 2-2 this year -- won in Charlotte, won in Minnesota, lost at home to Miami, lost at Lakers)
One other thing: curiously, through the first 3 game days of the 2013 playoffs, Joey hasn't worked yet. My su ion is that since he's very likely going to work late into the playoffs again (as usual) the league gave him a few extra days off early in Round 1. But it's pretty much unprecedented for an official of his stature to miss the first weekend of playoff games without being injured or suspended.