[Soundtrack] Mama Cass

Starting at 9.10, Katharina in her house and Hans on the car are both listening to Mama Cass's "Dream a Little Dream of Me". I think this is a quotation of "Beautiful Thing" (http://www.imdb.com/title/tt0115640/), where it's the closing song (when the two boys are dancing together with the mother).
"Beautiful Thing" is another happy ending coming out film.