When Mary sees Louis for the first time she says that he is 500 years old. This is very similar to what she said about the man who was sent from Spain to marry her to Charles of Burgundy when she was younger.
When Mary asks Charles Brandon if he is going to go to France with her to see her get married it is very possible that it is a reference to The Tudors. In the first season Charles goes with Henry's sister when she is married to a foreign King and on the way end up in bed together.