Some more bad:
Offensive rebounds: The Spurs continue to give up waaaay too many offensive rebounds to this team. They're already at a disadvantage athletically, however they need to make a conscious effort to fundamentally box out the OKC bigs and keep them off the offensive glass.
Defending the 3-pt line: The Spurs are supposedly one of the better teams in the NBA at defending the 3-ball. It didn't look like it tonight, as Fisher and Durant got pretty much what they wanted from behind the arc. This is not an issue that just started tonight. The Spurs have been slipping in this area ever since the all-star break, it seems.