Arnie: Laserdiscs are an interlaced source. You do NOT de-interlace when encoding to DVD afterwards. Therefore the answer is "nothing", Farsight would no doubt have not de-interlaced the movies (unless he didn't know what he was doing). When you watch on a computer, an automatic bob/weave filter make DVD's appear to not be progressive since your PC display requires progressive input.

You only de-interlace if your finished product will be a PC format such as Xvid/DivX, etc.

And before you ask about progressive scan DVD players, they internally convert to progess from interlaced information.

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