All final program scheduling decisions are determined locally by each of our member stations and it is possible that this show was acquired by your local public television station from a source other than PBS. Unlike the commercial television networks, which provide their local affiliates with a set program menu, PBS provides its member stations with shows from which they can choose and schedule independently.
You might want to contact the station that aired the show you watched. They may be able to identify the show and tell you who to contact for the information you are seeking. Contact information for PBS member stations is available using the PBS Station Finder.