Mr. Magoo said:
I'm sure they would have much rather given Willem Dafore a latex mask or no mask at all, but it's kind of hard to justify, if you know what I mean. Him having a green mask in his house that just happens to go with the glider suit is a reach, but it's not so much a question of internal logic as it is of plausibility. The rubber mask thing, on the other hand: what do you do about that? I know he's "ca-razay", but that basically means he'd have to break into a Halloween store, for some reason, decide he liked some weird goblin mask that just happened to be expressive enough to allow him to emote (so plausibility rears its ugly head in either scenario), steal it and break the **** out of that joint, or maybe he does his own makeup right before he goes 'a-killing. They made him nuts, but he wasn't *that* nuts. Plus it would look like crap on top of his glider suit. Unless he dressed in the whole "Goblin" ensemble, but, again, there'd be no reason for him to do that. You can throw your hands up in the air and say "Crazy", but it really is a question of character consistency and internal logic that has to be addressed. In this case I think contriving some way, no matter how whacked out, to get him into a goblin suit would have been worse for the film than his non-expressive mask was. Plus, at least Raimi got to go tongue-in-cheek with it on that one rooftop scene, so it wasn't all bad.