If I got arrested for weed and the amount that the officer put was inaccurate, could that help me in my case?

It depends upon the facts. Once I had a case that was brought as a felony because the cop weighed the pipe along with the weed, and that was over 20 grams, but the lab came back with a result that the weed was less than 20 grams. So, it helped because it was reduced from a felony to a misdemeanor.