Mars cast ordering

Mars, on National Geographic, is an interesting series and I don't think the cast ordering guide. There are script dramatic sections but also sections of experts giving opinions about all kinds of things. In the beginning, the regular cast members are listed along with the guest cast for that episode. The question is where to put the experts named on screen? Do they begin directly after the guest cast? There is also an ending cast which is the co-stars for the episode.

Another question, is how do we get these credits listed correctly. Some credits should go under acting and some under self. This is the usual case of a documentary containing reenactment scenes. It is the reverse. It is fiction contain some documentary scenes.