Well, as far as historical inaccuracies go....Catherine of Aragon was only about 5 or 6 years older than Henry, not the 10 or 15 years that the show portrays. Also, the mother of Henry's illegitimate son was more like 15, not 25.
I saw the show when it ran in the U.S., and there's a huge faux-pas in the later episodes when they completely mix up Henry's sisters.