The scene where Joel wakes up in bed at the end is shot exactly like the scene where Dorothy wakes up in bed. One of the characters even says he has to head home to Topeka (Kansas).
Chris: "There's a dark side to each and every human soul. We wanna be Obi-Wan Kenobi and, for the most part, we are. But there's a little Darth Vader in all of us."