If we were to have a Director's Cut...

[slo64]

Played through the mansion levels(plus a little of the basement), grabbed a chair and started smashing everything I could with it.
Almost all of the objects that would be expected to be interactive do have physics enabled, these include things like bottles,books,ink bottles,small pot plants....

Can't find the link now, but I've read somewhere that the objects aren't interactive because some tester guy just put all the objects into a pile, got on top of it, exited the level and said that the game was broken. I think it was in some Pinchbeck interview.