Jane's hair changes when she is washing it.
Jane Seymour was, in fact, present at Edward's christening.
Aske was approximately twenty years younger than portrayed by Gerald McSorley. The real life Aske did not have a family. He was a bachelor lawyer.
Henry VIII and Lady Mary both act like they have no idea who Dom Luis of Portugal was. As he was the son of Catherine of Aragon's sister Maria he would have been Henry's nephew and Mary's cousin. It is also stated that he was 24 years old. The real life Dom Luis was born in 1506 so during the time it takes place he would have been 30 almost 31.
At the time of Edward's birth, Princess Elizabeth was only 4 years old. However, the series makes her look as if she's much older.
At the end of the episode when Jane is lying supposedly dead in the church with a crown on her stomach, you can see the crown rise and fall as she breathes.