Five of the shorts on initial pressings of disc four were encoded as interlaced scan instead of progressive scan. IIRC, the affected shorts were Book Revue, A Corny Concerto, Have You Got Any Castles?, Hollywood Steps Out, and I Love to Singa.
I popped disc four of my copy (which I got off of...
The More Silly Symphonies: Volume Two replacement discs apparently aren't available anymore; I contacted Disney not long after they mailed me a repressed copy of disc one of The Chronological Donald: Volume Four (context: the ending of the short Bee on Guard was cut short) and received an email...