Have you watched the series "The Tudors"? It was certainly an entertaining programme, but being very familiar with this period of English history, I noticed a number of factual errors. These might not matter to most people, but when you've studied the era, it can be quite irritating to think that people will believe that the mistakes are facts! Here are some of the mistakes I picked out, and a few other things I think they got wrong.
Maybe it's a necessity for dramatic purposes, but time was really messed with here. Actors were too young or too old (no way was Jonathan Rhys Meyer old enough to have an adult daughter!), and events happened at the wrong point.