Later in the episode, though, Jon was crowned King in the North while Sansa and Littlefinger exchanged a worrying glance.
Littlefinger told Sansa that his goal was to be on the Iron Throne with her by his side and told her that she shouldn't let Jon rule Winterfell since he wasn't a trueborn Stark.
Sansa rejected his advances, calling it a "pretty picture," but she seemed to be considering his words more when the northern lords declared Jon the King in the North.