One of the most common mistakes in creating data in a standard format is not adhering a standard variable attributes. Verifying this by visual inspection can be a challenge since it is easy to define one variable with a particular length or label on one dataset, while a slightly different attribute on another. This difference can be tested by what I refer to as a DIFFTEST. This can be performed as a SAS macro or on an iPhone.
So when you are out and about and just have a sudden dire need to check on your data standards. :) I have recorded a video which illustrates how this can be performed on an iPhone.