Actor Börje Ahlstedt,who plays Mattis, has confessed that he actually lied about being able to ride a horse in order to get this part. When Ahlstedt arrived on the location, he sat down and wrote "You are great with horses" on hotel stationary for a whole night in order to get the confidence up.
When filming the scene where the robbers run out in the snow naked to clean themselves, two big portable saunas were rigged inside the castle set. The actors sat in the saunas and on cue, when cameras rolled, opened the doors and ran off into the snow.
Director Tage Danielsson read aloud from Astrid Lindgren's book every morning, preparing the cast and crew for the part that was to be filmed. "It felt like we were carrying Astrid under our jackets for the whole day", Danielsson said.
Angered Dalby inhabitants of Dalby picketed through the filming of Ronja Rövardotter at the shoot at Dalby Söderskog, claiming wild life was disturbed by the crew. The two parties settled out of court for an undisclosed sum be paid to the village's Council of Wildlife Preservation.