Story Idea: Person From Actual Medieval Ages Transported Into DnD World

[Clistenes]

On top of my head I can think of:

-Religion: The Knight would see everybody around as horrible pagans.
-Magic: There is magic everywhere, granted by those demon-passing-as-gods those people worship.
-Sex and gender roles: D&D world mostly reflects XXI century's gender equality, not real Middle Ages gender roles.
-Society's structure: There isn't anything like the Catholic Church, nothing like Canonic Law, monarchy and feudalism are warped, the knightly code of honor is mostly absent (the Paladin's Code has nothing to do with it).
-Money: Everybody are carrying heavy sacks of metal! D&D coins are huge and have little value when compared with real world's coins. Our knight would need 37.5 freaking pounds (17 kg) of gold to buy a decent suit of full plate, and another ten pounds (4.5 kg) of gold to buy a decent destrier.