Okay, after seeing Red5's screen caps, I retract all previous statements. The aliasing is in the master tape then, if it's in both the GOUT and the X_ captures.
Shoot, I really thought I was on to something. I was under the impression that there was much less aliasing in the laserdiscs, and if the aliasing was a symptom of bob de-interlacing, that would imply nearly twice the resolution in the laserdiscs. Looking at those screencaps, that is definitely not the case.
Sorry to confuse everyone.
-G