Asked by ESPN's Doris Burke what holes he was exploiting in the Heat defense, Rondo answered: "Them complaining and crying to the referees in transition."
Miami was called for 13 personal fouls in the first half (and 28 for the game), while Rondo picked up a technical after an altercation with Heat forward Shane Battier.
Following the Celtics' 93-91 overtime victory, Rondo again spoke with Burke and was asked if he expected any repercussions from his halftime comments.
"What I said was true," Rondo said. "I don't take back what I said. That's what it is."
The Celtics and Heat are tied 2-2 in their best-of-seven series with Game 5 set for Tuesday night in Miami.