The cast for the youth roles took part in a 8-month acting training prior the filming.
Borgarfjörður Eystri in Eastern Iceland had not been a filming location for any other productions earlier.
The only reference to the characters' ages in the film is during the playground scene when Beta says "We're not 12 anymore". Writer/Director Guðmundur Arnar Guðmundsson has stated in interviews that Þór and Kristján are 13.
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Top Gap
By what name was Heartstone: Un été islandais (2016) officially released in Canada in French?
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