Hayden is definitely the most noticeable change in the long term (so far!) since all it takes to recognize the incongruity is the fact that the Original films are much older than the Prequels. Perhaps going forward with petitions and awareness-raising messages, it would be good to highlight this change above others as an example of pointless revisionism.
yeah, i think that is the only change that stands out to even the most oblivious viewer, and strikes them as both wrong and pointless.