The music that plays over the end of the Luke Skywalker cutaway is the outro music from the Larry David show, Curb Your Enthusiasm.
The scene in the park with Olivia and Stewie could possibly be spoofing the scene from Annie Hall when Diane Keaton and Woody Allen are commenting about people in Central Park
In the scene where Stewie talks to Olivia, the background music that is playing in the store is "The Laura Suite" from the 1944 Noir Film Laura.