it's easy: since 15 years, i do regularly a 300km train trip to visit my family and get back to job and i wish one day, i would make the same meeting that this Tom had: indeed, a young Géraldine plays a train traveler who records talks of other passengers on tape
for sure, it's just a cameo without heavy consequences on the movie but she manages to be cool and funny
All the opposite of this Tom, played by awful singer / actor Pagny who has nothing for him!