Through the course of the movie, Scrooge's teeth continuously change from rotten to white.
When the ghosts are hoisting Scrooge into the air via chains wrapped around his body, in the wide shots, the chains are pinning his arms to his sides, while in the closer shots, his arms are free and gesturing widely.
A few women are seen at the London Exchange including two maids. Women were actually forbidden to be in places like the Exchange in Victorian times as it was reserved for men only.
As Scrooge and the Ghost of Christmas Past float down to see the first shadows of his past, the black strip holding the harness was briefly seen.