This episode marks the introduction of Dubrovnik, Croatia, as a filming location for King's Landing. In the first season, King's Landing was filmed in Malta and Northern Ireland, using a combination of actual footage and CGI. However, according to show-runners David Benioff and D. B. Weiss, the Dubrovnik location was so stunning and fit King's Landing so well that very little CGI was needed in many of the background exterior scenes. Dubrovnik was retained as a filming location for every season thereafter, with other locations in Croatia also used for a variety of different places in the series.
In the novels, it is made explicitly clear that Sandor "the Hound" Clegane hates liars. When Sansa tries to lie her way out of her blunder with Joffrey in the opening scene, Sandor steps in and backs her up - in other words, he became a liar to save her from beating.
The episode title refers to the rebellion of the North under their new King Robb Stark, in response to the execution of his father Eddard Stark. The phrase is also used four times in the novels (by Robb, Lord Wayman Manderly, Lady Barbrey Dustin and Theon), mostly in the context of a warning that the people of the North will get even with the Lannisters and their allies for all their atrocities.
Despite their shared disgust for Joffrey, in the novels, Tyrion and The Hound have a notorious hatred for each other. This relationship is alluded to when Tyrion points to Sandor and says, "This one doesn't like me much." The novels never reveal what happened to make them hate each other.
According to the novels, Davos' left fingers are cut at the first joint, as result of the punishment Stannis gave him for breaking the law for years. In the show, it was changed from Davos' left hand to his right, because the actor Liam Cunningham is left-handed.
Tyrion is whistling "The Rains of Castamere" when he enters the Small Council at the beginning of the episode. According to David Benioff and DB Weiss in the DVD commentary, this is the 1st time in the series that the theme is heard.
According to the novel, only one of Robert's bastards is reported to be killed at Cersei's command (not Joffrey's command) - baby Barra. It was not Janos Slynt, but one of the Gold Cloaks named Allar Deem who killed her and her mother who tried to stop him.
During the scene in which the idols of the Seven are burnt, Selyse Baratheon (Stannis' wife) is standing among the crowd. She is played by Sarah Mac Keever, but without dialogue or on-screen identification.
The white raven that appears in the Small Council scene had to be imported from Germany since the species is very rare in Europe. The bird is more common in North America, specifically Canada, but international regulations kept the production from importing one to Europe.
Daenerys' scenes in this episode (and two others following) were not actually filmed in the desert; this illusion was created using CGI. A year later, in Season 3, Emilia Clarke actually filmed her exterior scenes in Morocco.