Okay, since I constantly seem to get sidetracked by this issue any time I try to write anything about theme parks, I might as well talk about it now.
First some quick definitions. David Younger in his fantastic book aptly titled “Theme Park Design” (add link) outlines a few different design styles that have been applied to theme parks in their relatively short history. Here they are along with their (paraphrased) definitions.
Traditional: the classic form of design that originated with Disneyland that seeks to immerse you in environments. Characteristics include almagations of different kinds of spatial entertainment (not just rides), a trend towards experiential vs explicit story, loose theming. Pirates of the Caribbean or The Haunted Mansion.
So the movie begins and ends with an illustrated book fading into the actual action of the movie. I’ve always loved this kind of effect, especially when done live (the Jungle Book show at Animal Kingdom used to do this). So the opening curtain is styled in the same way, like an illustration out of a book with a scene of Scrooge going about town. When the music starts the lights fade and it would line up perfectly with the real set and actors.