I assumed it likely played as what it ended up as. :U
The only thing in particular was that one scene were Peach was alone underground. The thing was, this wasn't included in the final product, but it seemed to be the Unlucky Pipe Route, as the player had to roll a certain number in order to not fall to a lower level. At first, I didn't really get it, especially since they used Green Spaces to label everything. But it did show that everyone likely had animations for actual movement instead of just being in the car. I'm sure they still used them in the final product, for entering Pipes, Toad Houses, and certain Captain Events. Would have been interesting if they kept something that wasn't just "gain a few mini-stars" or "lose a few mini-stars" to which the higher the number the more mini-stars you gain/lose.
Heck, now that I think about it, was it possible for players to lose a turn? Because what if Peach fell on one of those falling platforms, would that render her unable to return for one of her turns? That would have been sooooo much more interesting, since the game could play with less than 4 players (although the event would be unable to occur in 2 player games). But even then, that could have been way to unfair, and was likely a little buggy, so that could be why that area design was scrapped.
I am thinking way too much into this.... >_>