There is so much that's great in the Gallagher episode.
-Gallagher's past as a chemist, and his mission to educate people to the dangers of electrons. Also Gallagher going to Universities to talk to Physicists about elementary particles.
-''You were a model before you went into acting.' See, I've practiced this. Why don't I have a talk show?'
-'You won't be able to play the State Fair circuit if you use that approach'.
Also noted is that things really went South once Gallagher started ripping on comics who 'talk too much about themselves', and his 'this is not therapy' remarks, essentially going after Maron's act without knowing it. Of course, we already knew that Gallagher hates all non-Gallagher comics.
All in all, the show was a great cautionary tale about planning for retirement during the time that you are making a crapload of money, should you be fortunate enough to find yourself in such a time.