The french fondly call the Renault 4L, which names de film, as "catrelle" (after 'quatre L'). It's an iconic car in France, usually the students' first car due to its low price.
The 13 songs that form 4L's beautiful folk-rock soundtrack are by Pajaro Sunrise (born Yuri Méndez Barríos, in Léon/Spain). After two albums he quit a band, took a sabbatical to recharge creatively, and had songs featured in series as The Big C and Castle, plus TV ads for McDonald's and Rexona. Songs like "Shooting stars on the road to Timbuktu" and "See you soon" create the perfect indie ambiance fot the movie.