Sounds like an interesting film, I'd definitely check it out (that goes for any films about 80s arcade games). To be honest, I was never a huge Dragon's Lair fan, though. I always sucked at it, and never got very far. I like done of the DL games on the Amiga, though (DL 2?) because it had a mode where it woudl show you arrows to let you know when to move the stick. Kind of cheating, but it also made the game playable. No denying the game's place in history, though.
BTW, the link to the video has an extra http: at the end, preventing it from working directly. Nice to see all that footage, though.
Creativity is letting yourself make mistakes. Art is knowing which ones to keep.