Factual error: In the Pope's coronation procession they play the anthem Zadok the Priest. It was composed by Handel for the coronation of George II in 1727, 235 years after this coronation took place.
Revealing mistake: On his way to be crowned, you can see the Pope's sneakers under his robe.
Chosen answer: The Borgias arranged Lucrezia's marriage to Giovanni Sforza for their own political gain. When Giovanni was no longer considered useful to them politically, they sought to end the marriage. Eventually, Giovanni reluctantly agreed to admit to impotence in exchange for keeping Lucrezia's dowry, which normally would have reverted back to the family in the event of an annulment. Divorce was rare at that time, and being unable to consummate a marriage was one grounds for an annulment. In the series, when the Borgias convene the College of Cardinals to have Giovanni prove his potency by performing with two overweight and unattractive prostitutes, he refuses because he is humiliated. The historical facts are mostly accurate, though the part about the prostitutes is probably fiction.
raywest