I'm not sure if this is known but I spotted this DVD-ROM version of Stunt Rally on eBay recently and was curious as to why it was a DVD-ROM and not a CD-ROM so I bought it.
It turns out it has a load of video content that features a behind the scenes look at the games development, the UK advert for the game, plus adverts for three different LEGOLAND theme parks as well as a Rock Raiders set/game advert.
What I was really hoping to be on the disc turned out to indeed be present, there is a full PAL DVD quality version of the games 3D animated intro. It's 720 x 576 at 25fps which beats the hell out of the tiny 320 x 240 at 15fps version seen on start up.
There are even snippets of Glacier's outro in the behind the scenes video in this same quality but sadly not all of the outro videos used throughout the game are present. The ones seen in game are however much better quality, they are 25fps and have much higher bit rate audio than the outros from a later re-release I have from Focus which came bundled with Island Xtreme Stunts, I have seen these higher quality outro videos in playthroughs so it's not surprising they are there, but this does tell us they for some reason skimped on the quality for the re-releases.
Below are comparisons between the two, it seems they didn't render the final sequence with anti aliasing so there are some jaggies here and there but it's definitely not an upscale, there is way too much detail that can be seen.
The pictures go AVI then DVD but then again it's rather obvious which is which, the DVD version does seem to have an overall different coloration to it and seems a bit green at times, I'm going to work on it to see if I can get the colors more consistent and match real element colors better.