I guess my definition (and the one I try to use in building my own collection) is that the original/error needs to have been "meant" to be printed that way - whether intentionally (e.g. the '74 Washingtons, which is very rare) or absentmindedly (e.g. the '79 Wills, '91 Topps Comstock, '89 UD Murphy, or most inaccurate data on the reverse), vs. something that happened as part of the printing process itself - the NNOF Thomas, the '89 Upper Deck Sheridan (partially obscured "OF"), etc.).
The more I think about this, the more I suspect the 90 Martinez is in the latter category.
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