The phrase "valar morghulis", the title for this episode, is High Valyrian meaning "all men must die". It is a traditional greeting in certain parts of Essos. "Valar dohaeris" (which is the title of the next episode, the season 3 premiere), meaning "all men must serve", is the traditional response to it. Along with Dothraki and Skroth, High Valyrian is one of the fictional languages created for the show by David J. Peterson based on what George R.R. Martin envisioned for his "A Song of Ice and Fire" novels which "Game of Thrones" is an adaptation of.
Varys: (to Tyrion Lannister) There are many who know that without you this city faced certain defeat. The king won't give you any honors, the histories won't mention you, but we will not forget.
Petyr Baelish: (after Joffrey Baratheon had chosen Margaery Tyrell over Sansa Stark) My Lady. My sincerest condolences.
Sansa Stark: They're right, I'm not good enough for him.
Petyr Baelish: You shouldn't say that. You'll be good enough for many things. He'll still enjoy beating you, and, now that you're a woman, he'll be able to enjoy you in other ways as well.
Sansa Stark: But if he's not marrying me...
Petyr Baelish: He'll let you go home? Joffrey's not the sort of boy who gives away his toys. You have a tender heart, just like your mother did at your age. I can see so much of her in you. She was like a sister to me. For her sake, I'll help get you home.
Sansa Stark: King's Landing is my home now.
Petyr Baelish: Look around you. We're all liars here, and every one of us is better than you.
Tyrion Lannister: Well?
Shae: (after seeing Tyrion's badly cut face) You are a mess.
Tyrion Lannister: I'm a monster as well as a dwarf...you should charge me double.
The episode won an Emmy Award for Outstanding Special Visual Effects.