The opening credits now include a clear image of the Subtle Knife, the titular object of the second book, on which this season is based.
This episode includes the first appearance of Bella Ramsey. She is the fourth actor from Game of Thrones (2011) to appear in the series after Ian Gelder, Lucian Msamati, and James Cosmo.
Around the 37th minute mark there's a sign on the wall for "asilo", kindergarten. The afore trivia is wrong. Asilo does not mean kindergarten. Asilo is a residence for elder people, where the elders who need extra help or have no one to care for them go.