This movie has been re-edited by Michael Mann. It is his definitive vision of the film. In order to create it, certain shots had to be lengthened, resulting in a momentary jump in the image.
What they mean is this:
We couldn't fit the director's cut of the movie in the space alotted by a single layer on a DVD, and we were too stupid/lazy to find a good transition point to refocus the laser for the layer switch.
Because I really doubt a "momentary jump in the image" is what the directory's "definitive vision" of his film contains.
