If you're a fan and you get a chance either to catch the rerun or see it online, you should check out episode 21109 (original air date 5/21/15). It starts with highlights from his Late Show finale, then has some brief comments by noted celebrities, and ends with two longer interviews w/Dave done in years past. In those latter interviews they get into a serious discussion of his career and the late night comedy landscape over the years. Dave is very insightful and articulate about the business and his career.