Apostrophe Neglect: Charles’? Charles’s?

Emily writes:

The CBC Radio 2 blog talks about a new radio show hosted by Gregory Charles. Maybe in this post, the blog writer got confused about whether he should’ve written “Gregory Charles’ new show” or “Gregory Charles’s new show”, so he tried to solve that problem by simply omitting the apostrophe altogether.
Also in this entry, the blog author has spelled the word “feuilles” correctly on his first try but not his second try.