Rondo's never been turnover prone for a high level pg. He's generally among the league leaders in assist/turnover ratio. He has a fairly high turnover%, but that's due to the fact that he shoots the ball less than other point guards. Rondo's made a few bad turnovers but a lot of them are not being in sync with his teammates. Last year no pg averaged 4 turnovers a game (some were very close). So far this year 7 point guards are, with 5 pgs averaging 5 or more. It's likely the effect of an abbreviated training camp.
I don't have a problem with most of the turnovers. I think most of them are just Rondo trying to be aggressive and making up for the fact that there is no one else who can create shots on the team at the moment (well, other than Black Hole Bass, I suppose).
My problem last night was that he let Jack get wherever he wanted on the court. It was not all on him (the bigs need to help more on the pick and rolls), but if he wants to be known as one of the best defenders in the league, he cannot have games like that. He was playing like a matador way too much, and you just can't do that. If he was tired, ask to come out, otherwise, he needs to do a much better job of digging in on defense, no matter who the opponent is.