Not noticed personally, but I was watching a youtube video of DLP the other day and discovered there are toilets behind Toad Hall in Fantasyland. I've visited 7 times and had no idea!
Also, on a recent trip I finally discovered the Zazu and Jungle Book snake statues in Adventureland, plus a little waterfall, that I'd missed on the previous trips.
This is a great website for lots of the little hidden details...
http://www.hiddendlrp.com