They have subtle horizontal lines through the picture that fluctuate, i.e., fade in and out. It is most noticeable on TESB:
That's a screenshot from TESB showing the lines, and here is a screenshot from about a second later where the lines have disappeared:
Those lines appear and reappear about every second throughout most, if not all, of the movie.
Is this just the way the discs are or is there something wrong with mine?