Nathalie tells Fabien about her beach house memories and he consoles her with his hand on her shoulder. After the cut, it is on her lower arm.
Nathalie is shown walking through the mud flats exposed along the beach at low tide. As she walks, she is clearly following footprints. Since the mud was previously underwater, the footprints must be from a previous take of Isabelle Huppert walking along the same path.