User blog comment:Gcheung28/Game of Thrones Season 4 Fan Brain/@comment-5973594-20140407153050

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The opening scene shows Ice, the ancestral greatsword of House Stark, melted down into two smaller swords. It had been forged in ancient Valyria and passed down through the generations.

This is the first appearance of Oberyn (a.k.a. the Red Viper) played by Peter Pascal. He's a member of House Martell, the ruling house of Dorne.

Elia Martell, Oberyn’s sister and wife of Rhaegar Targaryen, is mentioned. After Rhaegar was killed in the Sack of King's Landing, his soldiers killed Rhaegar's young daughter and infant son. Ser Gregor “The Mountain” Clegane, a knight in service of House Lannister, raped and killed Princess Elia.

The unfortunate details of Catelyn Stark’s fate are revealed. After her throat was slit by Black Walder, we’re told that her body was thrown in the river.

Joffrey reads the Book of Brothers’ entry on Ser Arthur Dayne, The Sword of the Morning, mentioning his leading of the attack on the Kingswood Brotherhood, and his defeat of the Smiling Knight.

There are four pages in the Book of Brothers for Ser Duncan the Tall, subject of George R.R. Martin’s Dunk and Egg short stories. Ser Duncan was previously mentioned by Old Nan in the season one episode, “Lord Snow.”

Ser Dontos Hollard returns to thank Sansa for saving his life on Joffrey’s nameday. He gives her an amethyst necklace worn by his mother and grandmother. Ser Dontos was last seen in the season two episode, “Blackwater.”

When The Hound explains his questionable ethics to Arya, there’s a reference to HBO’s The Wire in which Omar Little also says, “A man’s gotta have a code.”

Please note that I've given special credit to contributing community members who created the content I referenced: The Dragon Demands, Werthead, Rachel P, Gonzalo84, Opark 77 & LexiLexi.