No. We made sure to get ones that didn't look realistic. And considering my roommate is actually a skeleton in his dreams - as long as he's cool with them I really think our RA being on a power trip is the most likely explanation. My hallmates all looked more surprised than frightened.
I'm leaving them up for now. He chewed my ass but I technically didn't hang them anywhere against the rules or do anything to damage the walls when hanging them so I think I'm good. He's probably going to whoever's got more authority than him.