A lot has changed since Ime Udoka replaced Brad Stevens as head coach, with new faces lining the bench as both players and coaches. We've also seen a new offensive approach, one which tasks the players with increased movement both on and off the ball.
However, the most notable change has come on the defensive end. Udoka has employed a stringent "switch everything" system. However, miss a rotation or react a second too slow, and everything unravels pretty quickly.
Overall, the Celtics did a good job sticking to their defensive principles during the first half of the game.