I'm pretty sure they used the characters again here in the UK very briefly as part of an anniversary thing a few years back. I used to love the McDonaldLand characters as a kid, our local McD's had a mural too, and i loved Hamburglar. We had Happy Meal car toys with each character driving a different one, still got em somewhere i think.
I also remember they used to give kids paper hats to wear in the restaurants, like little sailor type ones. Most of our restaurants had both an upstairs and a downstairs (upstairs just for eating, not ordering) but they changed that here and its all just on one level now.