OK, I was doing some memory searches and I seem to remember two exhibits that don't exist anymore (or was it my imagination).
The first memory is of a "future attractions" exhibit on Main Street. My memory says it was close to the entrance about where the streetcar loop heads down Main Street.
The second is an art gallery in NOS. I remember you had to go upstairs to see it. It was quiet like a museum but I remember lots of excellent Disney art.
Are my brain cells playing tricks? This would have been back in the mid 70's.
To keep this thread moving, post your own vague memories here.