I find R Williams frustrating to watch. He has physical tools, he has instincts, but I still don't feel like he understands where to be on either end of the court.
Also, our perimeter players need to do a better job of playing physical on the interior, both defensively and on the glass. This murdered us against San Antonio, when LMA dragged our big out of the paint and the rest of the Spurs formed a layup line. And the Lakers are doing a lot of the same things.