It still kind of blows my mind that they planned the whole "Mata Nui is a giant robot everyone lives in" thing from the very beginning, and that they even scrapped part of the Bohrok story because it would have been too obvious of a hint so early on.

"No, we can't have a "Three Finger Island" because we still have about a decade to go with this story, and that's not foreshadowing, that's skipping to the end of the book."