I agree, he had those sort of mistakes, but it was masked by goals as you say, but for me the most annyoing thing right now is that it seems his attitude has changed. He always seemed like a confident player and believed in himself(and that is a good thing) but now it's as if he's thinking better of himself then he actually is so far.
Maybe it's all the attention he gets from media and ridiculus transfer sums being thrown around, who knows, but for me he seems a bit distanced from the actual matches for Juve as if his head would be somewhere else and not 100% in the game.