In the beginning, Liliane's monotonous, dull everyday life is shown. As a habit she reads a novel written by Marilyn French in the bus. In a following sequence, Jean and Liliane talk about ABBA.
This is might be a reference to the ABBA song "The day before you came" about a woman telling the mundane details of her everyday-life of which reading Marilyn French is a part - until she meets - possibly - the love of her life.