Dialogue Coach?

I don't know who the dialogue coach on this movie was, but this movie is full of non-Norwegian actors who not only look Norwegian, but they have the accent so perfect that watching it always reminds me of my childhood. My grandmother, who came over from Norway in 1914 at the age of sixteen to go to work as a maid, and who lived with us for many years, sounded just like the Norwegians in this film.

I would love to know who was responsible for making sure the actors got the accents right. I've seen plenty of movies where actors use accents that are not their own; I REMEMBER MAMA is the only one I can think of with an entire cast so uniformly perfect.