Wow I pity the people back then for not having access to spoilers contents like we do today. Watching films back then must of been like taking a leap of faith. Didn't anyone look up the word Lepus in the library or something?
But don't you see, that's the brilliance of it!!
"Aw, look at the cute giant bunny! Wait, what are you doing? AAAARGHH!!"
You know, this'd be great, but why bunnies? Puppies, cats, guinea pigs, they'd all work. But there's just no way bunnies aren't cute!