just a recent error 5$ dollar note list on ebay AOZ/BPZ , i think all error notes are issued cause to or due to something unusual happened in process of printing,
human or mechanical failure,something un intentional happens , i think some of the
error notes even rarer than rare note .Each one of the error notes very unique by its
self ,it because they were not done intentionally .remember this is never happen yet
in canadian error notes.only a handful of 1986 2$ bird series .and only 1 prefix letter
mismatch ,you have to remember that they were "ERROR" notes. The Treasury didn't design them like that.