Pa Kua / Bagua massively understated
I noticed that the internal martial arts were nearly missed altogether. Tai Chi had a vague mention, and Pa Kua had a brief demonstration with that Chinese cook guy. They didn't even cover Hsing Yi / Xingyi Quan. These internal martial arts are far more impressive than most of those covered in the series and I'm surprised they couldn't spare some time for them.
I received my DVD of the series this morning, and it says "series 1" on the front, which implies there may be a series 2. If there is I hope they will consider this truly kick-ass internal martial arts in it.