Watched Jefferson Lives again tonight.
And maybe it's just me and my family, but quite a bit of the dialogue, especially at the start, was incomprehensible.
They've always talked fast, but there was a rhythm to the dialogue and somehow it made it understandable (most of the time).

Heh -- when this was re-aired on Bravo a couple months ago, I posted the exact same thing. It's definitely not just you. :D