All scenery is CGi and the actors worked against green screens all of the time.
"Broms" as in von Broms means brake or horsefly in Swedish.
Walter Söderlund who directed the movie died during the movie was recorded. Hence Pontus Klänge had to take over as director.
Sarah Bernard as the waitress in the café is named is the name of a chocolate biscuit.
Lasse and Maja have an M and an L on their shirts and backpacks.