I think the taking plays off is not the biggest problem for the players. I think it is more of symptom all team experience during the regular season. Taking plays off in the playoffs is more troublesome.
What I find more troublesome has been the team getting caught up in the rhythm of bad teams. The last two games, and others earlier in the season, the Celtics are not controlling the tempo or playing their style of play, letting the bad teams dictate their play.
The lack of defense and ball security has been the most apparent issue against the Suns and Lakers. Brown and Smart have been two players still working hard, but a lot of others have been playing below their standard. It was apparent that Olynyk was just lost, really struggling, probably is hiding that he is sick or has a problem in his social life. Jonas is still struggling with his slump.
One player that I think has really been holding back the team has been Crowder. Things are a lot different for him from last year. His offensive has been a huge gain, but defensively it is different. Last night, he was burned multiple times on pick and roles, and the same was happening in the Cleveland game. This isn't to say Crowder is at fault for all the team's inconsistencies; he does need to up his game if we want to be successful in the playoffs. Because Derozan and James are going to be the big hurdles if we want to make it into the finals.