Wait, you mean he made an appearance, like a cameo, or was it just one of the commercials he was riffing on? I didn't watch the episode because I wanted to wait for the next film review, so I don't know what's going on.
Don Bluth himself made a cameo appearance. The gist was that he didn't take kindly to NC criticizing his later movies and a running gag was Bluth popping out of nowhere giving NC the death glare from hell.
What's missing in movies is same as in society: a good sense of work ethic and living up to ideals.