Doc Rivers  wasn’t exactly jubilant after watching the film of Sunday’s Game 1 loss to the Heat.
He talked before Monday’s practice about the importance of staying patient on offense — “very eager offensively and that hurt us ‘¦ we were pretty much a one-option team and very rarely worked the sets” — and the importance of keeping composure, something Paul Pierce  failed to do in the fourth quarter.
Rivers stressed the need to do a better job on James Jones  — “The fact that he took seven 3-pointers without taking a dribble, when you think about it, that’s poor defense” — and Dwyane Wade.
In short, it wasn’t quite a sneak peak of “The Hangover: Part II” in the old film room.
And when it came to analyzing his own effort after viewing the 99-90 loss again, Rivers pointed to one decision as perhaps his biggest error.
“I’ve got to do a better job of getting Kevin [Garnett ] involved,” Rivers said. “Kevin is one of our featured scorers and I didn’t think we did a good job with him at all.”
Indeed Garnett was an absolute non-factor on offense in Game 1, scoring just six points on 3-of-9 shooting. The Celtics  made a concerted effort to get Garnett going early, posting him up on Chris Bosh on their first two possessions, but then went away from a matchup that the team looked at as a advantage heading into the series.
“We got Bosh on an early foul, and then we went seven straight plays before we decided to look back to that spot,” said Rivers. “That’s not like us to do that. That was a mistake.”
Garnett had plenty of success in four games vs. the Heat this season, averaging 16.5 points on 54 percent shooting. And coming off of a Game 4 win over the Knicks that saw Garnett score 26 points on 10-of-16 shooting, it seemed a fairly obvious bet that the power forward would be heavily involved in the offense.
And as much as Rivers wanted to take the blame for Garnett’s lack of productivity, there is no question that the 14-time All-Star can be too unselfish at times. The Celtics want Garnett on the attack against Bosh, and that wasn’t the nearly the case in Game 1.
“I think we’ve just got to try to tell him to be aggressive when he gets the ball in the post,” said Rajon Rondo. “He is an unselfish guy, but we want him to be aggressive and take advantage of the matchup.”