Randyll Tarly's sigil depicts a huntsman facing left. In all previously displayed Tarly banner (including the ones seen in this episode), the huntsman faces right.
In the flashbacks to Aerys Targaryen, the Red Keep's throne room includes several features added by Joffrey during his renovation in The North Remembers (2012), such as the seven-pointed star window grating. Joffrey specifically stated that he was restoring the room to its former appearance.
Sam tells Gilly that it will be autumn soon, despite the fact that summer was deemed officially over at the start of Season 2 in The North Remembers (2012). However, Horn Hill is far in the south of Westeros. As we have seen in other parts, the effects of autumn have not yet been felt, such as the colors changing.
The physical appearance of Aerys "the Mad King" Targaryen in the flashback scene heavily contradicts all other representations of him made by both the TV series and the novels, particularly that he is clean-shaven: his madness increased so much that he was too paranoid to allow any blades in his presence, thus did not cut his hair, beard and fingernails for years. By the time of Robert's Rebellion, Aerys' matted hair was so long that it hung below his waist, his uncut nails several inches long.