A lot of this is pretty much directly stolen from the Vincent Price classic 'House of Wax'. Wax museum devoted to horrible deaths - check.
There are a worryingly large number of those around, Madame Tussauds Chamber of Horrors being the most famous.
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.
Meh, I'd argue that since it is SUCH a complete switcheroo, but what the heck.
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.
Yup, Vincent Price is always fun. Heck, I even saw the remake with Paris Hilton (Who is more plastic than the wax). The best thing was that the only character we actually see being waxified is a studly young male second lead (I won't mention who) though alas, no decent tying up first. Sigh... horror movies these days... no sense of peril for the male cast members, just hack 'em up and be done with it (And the one real exception, Hostel, well, the less said about THAT ghastly thing the better)
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.
Those work best when the patient is drugged up and unconscious, otherwise we're looking at Robin with his briefs around his ankles all the time, or a catheter... and I really don't want to imagine my poor little Robin in that sort of position. (I'm weird with my turn-ons, I'm not THAT weird)
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!
Good point, I wonder if he considered having ALL the tableaux posed with fake Robin's in them, so Batman wouldn't be sure which might be the real one.