Old Shame: It's possible the Fuentes/Fugelsang era is this, as those episodes aren't shown on television anymore. Also, during the 20th-Anniversary special (where Bob Saget returned), neither Fuentes nor Fugelsang were invited to intend, and neither were acknowledged at any point during the special. Bergeron did briefly mention them during the "300th Show" special, and some clips of their host segments were shown, but that was it.
Episodes from this era are sometimes shown on WGN, but very rarely and usually only before baseball games.
Recycled Script: Recycled clips, to be specific. As early as the Fuentes/Fugelsang era, old clips were being shown alongside fresh ones, albeit with new commentary. Most of the music montage segments were built on editing old clips together since the show's earliest days. Slightly justified in that the show is not as popular as it once was, and combined with the rise of online video (it doesn't just cause Network Decay!), it's reasonable to assume that the supply of fresh material has dwindled. Only fresh clips are eligible for the weekly prize.