Jeffrey - contact the appraiser and ask him to check the measurements. If you have previous appraisals that show different measurements, he should be willing to double check his work. Also, depending on the missing info, it may not have an impact on the value. If he won't check his measurements, appraisals are governed by the NC Appraisal Board who can be reached at http://www.ncappraisalboard.org/
Depending on the layout of your house, measurements can be difficult to take, and it's very possible he, or the last appraisal, made a mistake in measuring.