Which call was that? Unless you mean the double play that wasn't meant to be?
Unless maybe,
If the ump hadn't incorrectly called Greinke out, it's probably a double play anyway because he wasn't anywhere near 2nd base and had actually run out of the baseline. But because Adams thought Greinke was out, he didn't throw. And because Greinke was going back to the dugout right after he thought he was tagged, we don't know for sure if he would have made it to second (probably not, though).
It's a definite flaw with instant replay. The call that was made was probably for the best given the extreme ambiguity with plays like this. It seemed like a bad application of a rule to me, but that's baseball
Makes me wonder if players will just be taught to complete plays regardless of what the umpires do. You kind of already see that with some like plays at the plate or a runner running past 3rd because the third out could be overturned. Will definitely be confusing if it happens