Actually wrapping up watching this as I'm posting (it's on Netflix).
Overall, a very well done documentary. I could have used a full series about this - I know there's things they never really got to get into (like the lovecraft influence on Eternia) because of time. It covers the movie (and reminds me about the parts I did love about that mess of a film) and some of the newer stuff too.
If you're a fan, check it out.