Jette Søndergaard and Peter Hansen Tygesen who play niece and uncle in the movie are in fact niece and uncle in real life.
The first line of dialogue in the movie is heard after 9 minutes, when the uncle says "Nutella" as he and Kris are out grocery shopping.
The director Frelle Petersen met the entire cast of Kris ou les champs du coeur (2019), during the production of L'art de pleurer en choeur (2006), while working as assistant director. L'art de pleurer en choeur (2006) was shot in the same area and same dialect as Kris ou les champs du coeur (2019).