Claire (Lauren Ambrose) mentions at dinner that she has an overnight astronomy thing for school, and Nate (Peter Krause) and David (Michael C. Hall) cover for her. They then have a discussion about the planetary status of Pluto (is it, or isn't it?). The same discussion occurred on an episode of Peter Krause's previous show, Sports Night (1998), between him and his co-workers.
Claire (Lauren Ambrose) tells Gabe (Eric Balfour) that she would go with him to Barstow and stay in a creepy hotel room and read a Stephen King book. Balfour later went on to star in Haven (2010-2015) which was based on the Stephen King story, "The Colorado Kid".