1) Good news and bad news. As I stated above, Melo needs to play lower when defending man to man. A number of his blocks come against the player he is defending after having been beaten by that defender. Astonishing recovery quickness but not something a coach would like to see on a regular basis. A number of his shots also come from help defending and those can really be something to behold. And if you are old enough to remember Patrick Ewing at Georgetown, Melo sends a message now again. He went up to 12+ feet to block one last night that fits in this category. Not sure the message part was intentional, but it was delivered anyway.
2) Very few actually. Once again, as stated above, someone is drilling him on getting back behind the ball in transition defense. There are times he "shoots" (using that term loosely) and immediately after retreats down the court. Last night this happened to an extent I wondered if it wasn't negatively impacting his "shot." His shot selection is almost exclusively baby hooks or running "hooks" that really are not conducive to following your own shot for offesive rebounds. He rarely shoots facing the basket in live game action.
Not sure who is tasked with his development, but someone is doing a helluva bang up job with his kid. Accelerated learning might be an understatement. It's just small things right now, things we take for granted that should already be part of his game. But the improvement is tangible and even dramatic within that spectrum. Long way to go, but I am impressed and encouraged. Just needs to keep developing at this pace.