Another thing that might be worth hunting down is the comic book. (If there are decent scans out there.) It actually lasted long enough to show what happens after the movie ends.
There was also a separate newspaper strip adaptation done by Jack Kirby.
I’ve already provided dark_jedi the highest quality scans I could find of the comic books. There are actually some very high-quality scans out there of some of the comics. There were actually several different releases of the comic books, all using the same artwork, with some releases having far better printing than others. There were a total of 4 comics - the first 2 being a comic adaptation of the film (parts 1 & 2) and the other 2 showing further adventures on the other side of the black hole. They were actually pretty poor in terms of artwork and stories, but still definitely worth including as extras.
The Jack Kirby newspaper comics are totally different than the other comics released, and are extremely rare. The artwork is far better. I have searched and searched and searched and found nothing online but a few very small low-res sample pages. I don’t think a full set ever got scanned and uploaded online. I’ve searched absolutely everywhere and turned up nothing but people asking about them. In 2007, Disney published some of the strips with new coloring in their Disney Zone digest magazine. They never completed the run.