The majority of their losses were against below average teams, just a reflection of the randomness of the NBA and the grind of the schedule I guess.
That being said they may have dropped several games to terrible teams but they also got out of jail big time on at least 5 occasions where they really should have lost. The OT game against the Nets (of all teams), the one in OKC which 98 times out of 100 doesn't even get to OT save for that 10 seconds of madness, the double OT game in Boston, the Hawks game at Oracle, they almost blew a 20 something-lead against the Magic at Oracle, and then of course that Grizzlies game a few days ago
Some of that is credit to them of course, but it does really show how ridiculous 73-9 is and how much needs to go right for it to happen.