"So that's where this episode came from," Brandon said to himself.
(Before you correct him, I have told Sam that there were actually four musketeers in the original novel. Don't worry about it.)
Though we groaned a lot during this episode, I think it is really cool that Nomura tied a lot of the older Disney movies into established Kingdom Hearts canon. Without calling attention to it, they also explain King Mickey's backstory, even if they use time travel in a dream to do it.
The plot device of the sleeping worlds, despite how silly it is, actually gave the writers an excellent excuse to work with previous Disney films. I appreciate the originality.