The part where we nitpick Benjen's horse
Undead Benjen likes to fight wights with a weaponized censer while on horseback. This week, he holds them off while sending Jon back to Eastwatch on his horse. But hold on -- how'd he get that horse in time for this very special purpose? Put on your overthinking caps.
First, the horse had to appear out of nowhere, as it is a living horse and Benjen’s ranging horse is what returns without him to Castle Black in Season 1, Episode 7. Second, Undead Benjen takes Meera and Bran to The Wall, but can’t pass through it because of enchantments against the undead. Then he leaves Meera to drag Bran the remainder of the distance while he leaves the young girl and the cripple on his perfectly good horse. Poor Meera takes a whole off-season to lug Bran the remainder of the distance, and it takes long enough that the rest of Brandon Stark’s personality froze and broke off somewhere along the ride.