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Yes. The fact that they (and I'm assuming this was an officer) described you in error will not get the case dismissed, but it is powerful evidence that the officer's (or someone else's) observations were flawed and you are not guilty.
You may absolutely use this in court.
I hope this helps.
Probably not. If you admitted you did it, then the fact that they got your physical descriptors wrong is pretty much irrelevant.
Probably not the answer you wanted to hear, but I hope it helps.