Good catch with the galleon in Seoul, I didn't remember it.
My favourite ceremony closing was Albertville closing ceremony, first of all because I was there.
At the end of the show they asked to the spectators to get down on the stage and mix with the athletes. I got to dance with Chinese skiers for the end of the ceremony ...
Well you would not do these kind of thing these days, too many security concerns.
I think the main problem with handovers is that the Organizing Committees haven't completely made their minds with the topics, looks, graphic rules, sound, etc... of their Games. So this always look disconnected from the future Games. I remember for instance the short-lived mascot of Albertville which was seen in Calgary and never seen again.