The title of the film comes from an Swedish old expression to describe eccentric people; "he's a real crown jewel".
Alicia Vikander wore 50 kilogram lead to be three meters under water.
Karin Franz Körlof's debut.
Karin Franz Körlof was born in Ytterby, Bohuslän, Sweden and is of German ancestry,
Alicia Vikander's first of many nude scenes. While she did perform sex scenes in her previous movie Pure (2010), her body was strategically covered so no nudity was shown.