A lot of this is pretty much directly stolen from the Vincent Price classic 'House of Wax'. Wax museum devoted to horrible deaths - check. Guillotine display with dummy replaced with REAL person? Check. Corpses masquerading as dummies underneath a skin of wax? Er, no, but we have a bunch of dummies pretending to be corpses, so it's the old switcheroo, really - still counts as a reference, I'd say. There are more parallels, but it's a good movie, and I don't want to ruin it for anyone who hasn't seen it. And I would imagine that Robin's *ahem* personal needs were taken care of in the same way that people in comas are cared for in the hospital - a bedpan. Also, I'm guessing that Ravek shaved Robin, too - I think the idea was that he was trying to make sure that THIS Robin looked as identical to the dummy versions as possible, so that there would be that one, lingering doubt in Batman's mind as to whether THIS one was real or not until finally - CHOP!