The first episode to include Bran Stark (Isaac Hempstead Wright), Meera Reed (Ellie Kendrick) and Hodor (Kristian Nairn) since The Children (2014). Their plotline was left out for more than a season because it would mostly involve Bran receiving training. The writers also wanted to give the other storylines in the already crowded fifth season the opportunity to catch up, as compared to the books, Bran's story was already running ahead of the rest; the only chapter that had not been adapted involved Bran having numerous magical visions of the past (none of which included Hodor), which was expanded over the sixth season and also included some flashbacks from other characters in the books (like Ned Stark) with new material.
The first appearance of Ned Stark's sister Lyanna, though in a flashback. She is introduced while riding a horse and wearing boy's clothing, referencing the books where it was mentioned that she was a tomboy not unlike her niece Arya, and one of the best riders in the country, male or female. Cordelia Hill was cast due to the fact that she had a passing resemblance to Maisie Williams; in the books, one of the few things that Ned Stark said of his deceased sister was that she closely resembled Arya at the same age.
During Bran's flashback to Winterfell, a young Ned Stark advises Benjen to "keep your shield up, or I'll ring your head like a bell." Jon repeats this line to Olly in The Wars to Come (2015). The hands' positions on the respective characters' heads mirror one another. In the novel, Jon repeats the warning to the brother Satin.
In Bran's vision, Lyanna mentions that Eddard is to leave Winterfell for the Eyrie. In Westeros, it is customary for young noble boys to be taken in and trained at allied castles, as part of a rite of passage, but also to broaden their education and experience, and to forge lasting friendships with other houses. As mentioned in season 1, Eddard was fostered in the Eyrie by Jon Arryn, where he formed a life-long friendship with Robert Baratheon.
The first appearance of Max von Sydow as the three-eyed raven. The role was previously played by Struan Rodger for the character's first human appearance in The Children (2014).