There are some series they sometimes do, which are entertaining to follow. I also enjoy things like Journal club, where they pick a paper and deep dive into it. The audience also participates, in a way, where they pick the questions/comments from the previous video and answer them.
However, it's not all academic either. There are some running jokes etc, which keep the content entertaining, while being informative, a format that I see common in some of the best Youtube channels.