But the lecture turns parental where at one point it might have turned lascivious. Don's not a stranger to vulnerable girls looking to have fun, but it's evident that all he can see when looking at this would-be groupie is his daughter, who's facing the prospect of growing up without a mother. As much as he likes Megan, the awkward dinner with the Heinz couple ("Don was divorced," she says baldly) and the talk about the trip to the beach make it clear just how much she's not Betty.
But Betty, at least, is due for something new. That specter of being shown up and replaced comes back one last time in the final scene in which she's eating sundaes with Sally. Sally, played by the ever-prettier Kiernan Shipka, can't finish hers, and leaves the table. So much of Betty's conflict with her daughter has been based around a subconscious rivalry, but Betty doesn't treat this as a competition of self-control (something that's been such a part of her personality before -- "you're just one of those girls," as her mother-in-law observes). Instead, she reaches for and digs into Sally's leftovers.