With an 8,500,000 Euro budget, it's the most expensive Finnish film ever.
Onni Tommila (Oskari) is the real-life son of Jorma Tommila (Oskari's father, Tapio). They also played father and son in Papai Noel das Cavernas (2010)
The adventures in the wilderness take place in Finnish Lapland, but the outdoor footage in the film, is actually from the Alps. In Writer and Director Jalmari Helander's opinion, the real Lapland locations did not suit his image of what the scenery should look like.
Out of all the PG-13-rated movies Samuel L. Jackson has appeared in, this one is the only one to permit him to use his trademark word, "motherfucker". He has notably never said it uncensored as Nick Fury in the Marvel Cinematic Universe.