At first, I thought it was really odd that Drusilla didn't say anything in that last scene. I expected a little, "Hello grandmother," followed by her patented crazy-talk. But on review, I suspect that she was silent because that way her name didn't have to appear in the opening credits, and she'd be a big surprise. So I'm okay with that. Since we're gonna be in reruns for a while, you can pass the idle hours trying to come up with in-character theories to explain why Dru wouldn't talk.