At the end of the video here-- I had no idea they finished the Gargoyle scene from Dragon's Lair for a 2002 release. There was one shot of this in the prototype (attract mode), and the story goes that they'd animated it as a pencil test but never colored/shot it. They may have just faked it from existing material though. The actual gargoyles animation is minimal (basically just what was in the attract mode shot), Dirk's animations could have been reused from elsewhere (his falling certainly was), and his skeleton death/respawn animations are wonkily Photoshopped in from the existing (I believe laserdisc) release. (By comparison recent releases repurpose Dirk's spawn animation with extra effects very cleanly.) I don't think the 2002 Gargoyle scene has even appeared on other releases? Probably for that reason, that it's a little wonky and stands out.
By 2006-7 the original film had been remastered in HD, and in widescreen, so it probably didn't fit.
The Dragon's Lair prototype laserdisc had a lot of animation unused in the final, including multiple branching paths for exits and options in scenes that weren't used. The Giddy Goons scene also plays out differently, and there's a respawn animation for Dirk where he isn't a skeleton.
http://www.dragons-lair-project.com/gam ... efault.asp
Some "extra stuff" survived to the arcade version - an opening scene where Dirk crosses the drawbridge outside the castle and fights a tentacle monster, which is often in home ports (and some Arcade versions), and a "Boulders" sequence when Dirk is rafting on a barrel.
I believe that emulated versions on Daphne have made all this stuff playable (albeit not in HD), and some of the home ports also.
For example, here's a video of someone playing, on an arcade cabinet, the Prototype version of Dragon's Lair, and purposely doing most of the unusual stuff that's not in the final release (as long as it doesn't get him killed). A little hard to see but it's there. Note that this is still in SD 4x3, probably sourced from the 20th Anniversary DVD.