A lot of applications asks the prospective applicants to talk about weaknesses.
How did the current batch address that ? Did they limit their weaknesses to say 1 or 2 items. Also, some of the rec letters ask the recommender - areas of/for improvement. Should the above two points tie in ?
If you have made mistakes, there is always another chance for you. You may have a fresh start any moment you choose, for this thing we call "failure" is not the falling down, but the staying down.