Not really.
I believe you meant "Yesterday, you made very few grammar mistakes while talking, if any."
or "Yesterday, you made very few grammar mistakes while talking, almost none."
Hope this helps!
2017년 1월 16일
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Yesterday, you made very few grammar mistakes while talking, HARDLY any.
Yesterday, you made very few grammar mistakes while talking, almost NONE.
Both of these essentially translate as "casi ningún error" in this case.
2017년 1월 16일
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Almost correct! Just change one word.
I think you mean to say:
Yesterday, you made very few grammar mistakes while talking, almost none.
2017년 1월 16일
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Accidentally posted here instead of in the answers. Moving my comment....