User blog comment:Gcheung28/Game of Thrones Season 4 Fan Brain/@comment-5973594-20140407121859

I caught references to...

Rhaegar's taking of Lyanna

​Ser Arthur Dayne/The Sword of the Morning

Dunk and Egg (awesome)

Catelyn Stark's fate -- for the first time if I'm not mistaken

And I'm pretty sure the writers even threw in a reference to The Wire (!) with the Hound's quote about having a code.

What did everyone else think? Spot anything else?