1. Bran repeated the iconic "chaos is a ladder" line back to Littlefinger, revealing that he knows about Lord Baelish's true intentions.
Bran Stark (Isaac Hempstead Wright) and Littlefinger (Aidan Gillen).
Petyr "Littlefinger" Baelish tried and failed to rattle Bran by giving him the same blade used by the cutthroat to kill Bran on the first season. Then he tried to get Bran to divulge information about what he'd been up to beyond the Wall.
"To go through all of that and make your way home again only to find so much chaos in the world," Littlefinger said. " I can only imagine —"
"Chaos is a ladder," Bran said, interrupting.
This was what Littlefinger told Varys on season three, when he revealed that he had been manipulating Sansa and Joffrey the whole time.
Season 3, Episode 6: "The Climb"
For most of the earlier seasons, Littlefinger's motivations were mysterious. But he laid out his cards on the third season when he told Varys that creating chaos was his mechanism of ascending the rungs of power in Westeros.
"Chaos isn't a pit. Chaos is a ladder," he told Varys. "Many who try to climb it fail, and never get to try again — the fall breaks them. And some are given a chance to climb, but they refuse. They cling to the realm, or the gods, or love ... illusions. Only the ladder is real, the climb is all there is."
If Bran has seen this conversation through his greensight visions, it means he probably knows about everything Littlefinger has done — including betraying his father Ned.
2. Arya's struggle with entering Winterfell was a perfect mirror to the first season when she accidentally left the Red Keep.
Arya (Maisie Williams) needed to manipulate the guards in order to enter Winterfell.
When Arya finally made it to Winterfell, she was stopped at the gates by two guards who refused to believe she was really Arya Stark. The same thing happened to her on the first season when she was chasing cats and got lost in the dungeons of the Red Keep.
Arya made her way through the Red Keep's sewers and finally got back around to the gates, but was laughed at by the guards there.
Season 1, Episode 5: "The Wolf and the Lion"
When she was younger, Arya used a lot more back talk to convince the guards that they'd better let her in the gates. But now on season seven, Arya's response to their disbelief was more measured and mature, relying on cleverness as opposed to an indignant attitude.