I LOVE THIS!
I went to grad school for Library and Information Science at the University of Pittsburgh. I specialized in archives. The Mister Rogers archives is housed in a special library at Pitt. At the time I was in school, the archives were just a disorganized heap of materials. As part of my grad school program, I got to be the person to archive them! Each episode’s script came with a small square of paper stapled to it, indicating which color cardigan he would wear in that episode.