runtime?? multiple versions??

The listing here says the official runtime is 80min (1:20), and no variants such as director's cut, extended version, UK release, etc.

On youtube there are several versions of this flick that list the times as 1:44, 1:35, etc. I grabbed them for offline viewing, and they're crappy versions to be sure (250meg for what *should* easily be 3x the size), but yeah, the runtimes are indeed that long.

Both seemed to be cut off, though. One cut off when this guy was being chased, tripped, and impaled himself on a sword, and the other cut off with happy music of all 3 riding off on a dune-buggy, but neither had any end credits. A "borrowed" copy I got is indeed 80min, and ends with real end-credits.

Are there versions out there with 20min+ of extra scenes?!?