Review the powerpoint that you looked at before.
Does the information about book series extend to Nonfiction books? What are nonfiction series like? Are they always shelved right next to one another on the shelf?
Nature's children is a good example of one that is close to each other on the shelf, but will have other books in the middle occasionally.
Have students work in groups to make 2 posters. One for Fiction Book Series that they like (basically copy the one in the powerpoint, but add series they like on the side). Have them make one for Nonfiction books that tells about them. You will likely have to pull some nonfiction book series for them to review.
Pay no attention the (wo)man behind the curtain!