When Humpty transports Mary and the rest to King Cole's castle, there is a scene where they show the entire room. The King and Queen are standing behind the entrance curtain. But, when they zoom in on it, they aren't there, instead showing Bo-Peep. That exact scene is used again right before the King and Queen make their grand entrance.
When Humpty stands up right after he is put together, you can see a crew member standing behind him for a second.