Ken, Regarding Errors ... The number of errors reported for POGs has been very limited. Only off-center cuts have been identified. Slightly off-center cuts are not unusual, but POGs with portions of three different POGs visible are rare. So far, seven are known. I did see one on Ebay that sold for $ 35, if I recall correctly ...
You may find alot Pogs that are slightly off center , However, there are few known examples of the different Pogs all on the same pog. I would call that a Printing error... Thats from 2004 .. I have seen another one dated 2005 ...