That is a tough question to answer and a tough scenario to fully gauge, but I will give it my best shot:
Unfortunately, I believe you may have already done everything you can do. If your concern is that you anticipate that this person will mess something up, there isn't much you can do until that time comes. You have made your recommendation to not hire this candidate, so you have essentially done your part. If your recommendation was overridden by HR for some reason (other than technical), then I suggest you accept it and move on.
When and if the time comes, I do not suggest you take the "I told you so" attitude. However, as a CYA, I do suggest you save any correspondence you may have had concerning the matter just in case this fact is somehow "forgotten" over time. In the meantime, if this person is a co-worker or direct report, do what you can to lead them in the right direction and if necessary, have somebody double-check their work. Again, you have to be a bit inconspicuous about this as you run the risk of said person claiming they are being singled out or discriminated against (a definite HR no-no).
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