The simple answer: Yes. Sometimes it can be something as simple as sashing and corner stones not fitting. Or a 9-patch develops a mind of its own. In general, I have the rule that - if the error is glaring (to me) then I will take it out twice and redo. If on the third time it is still off - it stays that way. Found out over time that the error usually disappears in the sum of the parts. We are sooooo close to the work that we see every missed point and every seam that isn't perfectly matched. We need to give ourselves a little leeway.