It's very interesting to see the filming material used for rotoscoping the characters.
I find it very funny that when they filmed the actress doing the princess (it's cool to see her doing the swirl with her skirt to face the Prince!) they were young nerdy men interacting with an attractive young actress, and they were pretty shy about it! I think Jordan Mechner recounts this somewhere, probably his book about the making of PoP.
(The book is something I really want but never decided to pull the trigger, go figure. Maybe because I already read a lot of it way back when it was a free blog?).