First I doubt Red had any say in Pitino I believe it was forced on him. Second I feel Danny for eddie (good solid pf) and Kleine (good solid c) was a good trade. No way Ainge could have taken minutes away from reggie and shaw. Shaw was a good athlete like danny but not the player, reggie could have been something really special.

This isn't to say that danny wasn't a good ball player by the way, a great great athlete who worked his ass off to develop a very good outside shot.
And third the len bias draft would have capped the most amazing group of movements ever in any prof. sport. He didn't put the crack pipe to bias' mouth. I believe (not counting work levels etc) that Bias would have been better than MJ (who is not the best ever by the way)
OK, as some have stated red made no mistakes.
but boo boos would be:
the mess of free agency back in the 70's, sidney wicks
paul silas leaving, boston could have done more with him and that group
paul westphal charlie scott
So actually all 3 were 70's things