It was so cold when shooting that the crew and actor had to warm themselves with bottles filled with hot water. The director even crawled up in a sleeping bag.
The title "Crois moi ton frère qui t'aime" (French for "believe me, your brother who loves you") is derived from the end of a letter of Theo Van Gogh to his brother, Vincent Van Gogh. It was one of the last letters Vincent received before committing suicide.
Noah De Meester was supposed to be hung up to the tree, but after miscalculations of the co-director the tree turned out to be much taller than expected. All hanging equipment could not be used.
The painting on the film poster was painted in oil paints.
The first version of the movie was about a young boy dealing with the passing of his dog in the same field as the current movie's location.