At GM, if it's worth doing, it's worth doing badly. Around 1990 this car was built. GM settled on an international theme, even though Oldsmobile hadn't sold anything in a foreign country since 1925. Anyway, absent international sales, they decided on plastering the fender with a bunch of flags. That should make Toyota buyers take a second look. It didn't, and their gaffe went unnoticed.
To save costs, GM got the flags out of an old encyclopedia. Had the cars left the US, someone might have been offended. The Spanish flag is left over from Francisco Franco and his Falange. Spain's flag was different by the time this car came out, but it didn't matter.