This will teach me not to operate a computer without sleep... I get this now. Very interesting. Still, there should be copies of this microfilm in numerous locations. Hard to change them all. If new ones were issued, there would be an institutional memory of this at libraries in Hawaii.
Libraries yes, but how many copies of microfiche are there? Certainly not hundreds. More like probably 2 or 3 (just guessing). If they've put them on optical media then there's probably a master copy plus backups.
It's hard to say. But the most interesting question is why the twins don't show up in those papers birth announcements when they have evidence they were born just a day later.