The biggest key has been... ball movement.
They aren't just chucking up long 3s or dribbling out the shotclock and playing iso-ball. The ball is moving around, and they are aggressive in driving and getting to the hoop. A good example was late in the Wizards game, Tatum driving to the hoop twice and scoring both times as opposed to attempting a random 35-footer even when it's just a 1-point game.
Kemba looks like Kemba again and Timelord is just a breath of fresh air in the frontcourt. That helps too.