7 Faces of Dr. Lao (1964)

The old DVD's track has significantly better detail compared to BD, especially on the score. The BD has some extra detail on dialogue, but also exhibits strange artifacting (e.g. sample 3, 0:20) which suggests possible AI "enhancement" or some other form of aggressive filtering. In contrast, DVD appears to be completely unfiltered and sounds good throughout. Samples

As the BD is significantly rolled off, a lot of the detail (real or fabricated) is buried in the mix and not audible during normal playback.