I'd be curious to see if there were any discoveries of any cut features left on the cutting room floor still present in the code [0] (aside from the demo teaser code mentioned still being present). I always find software archaelogy fascinating, as we get scraps of unused content or code, and can only guess as to the decisions made that led to it being scrapped, or why certain custom file formats were used, or code was structured a certain way.

[0] I am aware that such a wiki exists exactly for this purpose.