It's been a little while since I listened to the interview (for whatever reason I just now noticed your post here), so I can't give specifics as to why the after-discussion stuck out to me, but I recall it cast the interview in a different light and comparing your takeaways and impressions with mine was entertaining.
The interview was impressive, don't get me wrong, but the post-interview stuff helped expand it from Random Conversation With Random (Albeit Interesting) Guy.