The new episode with Brian Regan was an absolute gem! I didn't think the series could reach the highs of the Larry David episode again but this one pretty much did. Regan is apparently hugely popular in America. His comedy is absurd and a bit ridiculous which Jerry seems to enjoy and I definitely did too.
The show and its conversations always seem to flow so well that its hard to know how much or indeed if any of it is set-up or broadly guidelined beforehand. There's no real common topics between the episodes, it just seems that they meet up and end up talking about anything at all which is cool.