The actors were not given the script, and the movie was filmed chronologically.
Susanne Wuest lived alone for three months to prepare for the role, often completely swaddling herself in bandages. She also kept two pet cockroaches.
130 pairs of twins were auditioned for the lead roles.
Throughout the movie, the difference between the twins is Elias is left handed and Lukas is right handed. This is shown many times like eating sausage, throwing Hail stone, opening doors, brushing teeth, etc.
The film was selected as the Austrian entry for the Best Foreign Language Film at the 88th Academy Awards, but it did not receive a nomination.