Joe Jonas?
On today’s episode Paul said that Joe Jonas played himself on BoJack Horseman in “many episodes.” I have rewatched BoJack 8-10 times, and have no recollection of this. Basic internet searching confirms that no Jonas brother was ever on the show. (The Jonas brothers were the musical guest on an episode of James Corden that Will Arnett and Aaron Paul were on to promote the final season of the show.)
So who was Paul thinking of? Plenty of celebrities played themselves on BoJack, but the list of those who did it multiple times is short. Margo Martindale, Jessica Biel, Zach Braff, maybe a couple others.
Is Paul thinking of a different show he was a voice actor on?