Verification is of course an important step. I would like to say that this verification step as statistics with respect to research. In research, although we get the result we should check whether the stats shows the same difference. I was involved in a human study where demographic details would play an important role. Age, sex, race , education are some of the factors taken into consideration. If these are not balanced then they have to either go ahead with increasing the population or try to analyze in a different way.
In case of verification, small changes would be enough and should be tested. If it is really a big issue then great measures should be taken.