I watched this scene repeatedly and wondered about Don and his children, and how much he misses them. When he comes home from work and Celia asks if his kids are coming, he says no, and then becomes impatient with her about the location of his his shoe kit. He now also has pictures of his children in his office. Bobby greets Don excitedly when Don picks up Sally and Bobby, and Sally gives Don a smile when she says goodnight to him. He pauses and looks at them in the dark after saying “goodnight, both of you.” A genuine moment of a man who misses his children, and genuinely seemed to miss saying that to them every night.