I'll sum up what I wrote in that thread:

Most clips are from the 97 SEs (and not the official released transfers either). The scenes that were CGI'ed for the SE were replaced with very crummy-looking, low-res transfers of LFL archival prints. They seem to have even less vertical image detail than the GOUT.

The dailies, outtakes, and raw effects footage have similar quality issues - in fact, I noticed the same jaggies in some of the clips in "ILM: Creating the Impossible", so maybe LFL transferred all this stuff at the same time?