At the beginning of the movie, the main characters meet at a cafe in the late afternoon. They then go home and get ready to travel to Bordeaux to pick up their kids. On the trip to Bordeaux, they are stuck in heavy traffic. Although it is now early evening, the vertical shadows cast by the cars indicate that the traffic scenes were shot at mid-day.
The tiny hole in the forward facing side of the center rear view mirror (sensor for automatic headlight dimmer?) is on the passenger's side early in the film. In the last scene it's on the driver's side.
At the first police roadblock, Jean-Pierre Daroussin throws his mobile phone out of his car. However, when he gets out of the car to berate the officers, there is no sign of the smashed phone on the road.