doubleofive said:
That "No" isn't true. It's impossible. You'd think if Lucas always intended Vader to say "no" HE WOULD HAVE HAD HIM DO IT BEFORE NOW.
Indeed, the other changes have allegedly been about George not having the technology previously to realize his vision. Getting Vader to say "nooo" doesn't require any technology that wasn't available in 1977. Or 1927 for that matter.