Goofs

When Serge teaches Jessica / Cécile the different Belgian accents, he focusses on the one from Liège, and tells her (with the accent) that a Liégeois talks a bit like a Swiss who would have been eating waffles the whole afternoon ("un petit peu comme un Suisse, si tu veux, mais qui aurait mangé des gaufres tout l'après-midi." A Liégeois would never pronounce the letter 'r' in 'gaufre'. A waffle in Liège is pronounced 'gauff'.

The Thalys train is seen leaving Bruxelles-Midi station. As it supposedly arrives in Paris, the station the train comes into is visibly Bruxelles-Midi: the pillars on the platform give that away. As the characters exit the station, they are in Paris-Nord.