Okay, here we go.

At 17:48 of the "Soundtrack!" THX promo, everything is fine.

At 17:52 the pixelating begins and lasts a second or two.

At 17:54 it becomes part of something involving Jabba, not the THX promo.

At 17:59 it goes back to the THX promo, then the image freezes, the sound stops, but the DVD player counter keeps running until I stop it.

This behavior happens on two standalone DVD players, my Blu-ray player, and my computer's DVD drive. I tried it 3 different times and used 2 different burning programs, as well as downloading the whole disc all over again.