Here's one of the educational shorts put out under the auspices of the Encyclopedia Britannica. Released as the second edition of a movie called "The Airplane Changes Our World Map, it discusses such arcane issues as how to represent our essentially spherical earth on flat maps, using a variety of what are called 'projections.'
I don't expect such dry material, offered with a narration in a calm, lecturing voice, to be popular, but it is the sort of information-laden lecture that I enjoy hearing, with plenty of images to illustrate its these and various sort of map projections.
Not a year goes by without seemingly at least one new cartographer coming up with a new projection method. Still, this gives a good, basic idea of the issues.