In October 2011, Ted sees the slutty pumpkin costume in the window of a shop, where the owner divulges the identity of the woman who rented it in 2001.
When Ted decides that he needs to break up with Naomi, he is stunned to see her wear the slutty pumpkin costume; he says that he loves her and they have sex.
After Naomi consumes a Tootsie Roll cocktail, she confesses that she found their relationship as awkward as Ted did, but felt similarly resistant to ending it.
Lily's judgement is impaired by the fact that she has "pregnancy brain", and impulsively decides she wants to live in the suburbs after she and Marshall are given her grandparents' house.
When Lily realizes how her pregnancy brain has affected her ability to make decisions, evidenced by giving the trick-or-treaters a stapler, scissors, and a bottle of Pinot Noir instead of candy, resulting in the door being egged, she agrees to wait until she can think clearly before she and Marshall decide not whether they want to move.