Ah, I recall that from the oldest shit rip I have seen of GitS... I believe that is an actual animation artifact, not a video fault.
I am pretty late to the party, but for future readers,
@Lillymon and @Krudda
Those are so called burn marks (the bottom of frame) and glue marks (bright stuff on top). They are present on the actual film from the process of cutting. You get that on lots of old cel anime DVDs, unless they are overcropped enough to dispose of them, or the authoring people used some software to hide them (motion compensation from neighbour frame, I noticed that on Andromea Stories, man I would like that software).
Sometimes they are left on DVDs because they counted on them being hidden in overscan area.
Poor man's solution is to freezeframe such. If there isn't an identical duplicate, it is a tradeoff. In simple pans the unique frame might be sarificeable, in some cases the lost frame (especially if it is a lot fo them in row) might be too precious though... sometimes, the ideal solution i to photoshop, but that is such an effort, that it is not reasonable to require it.