Despite the liberal use of firearms, as well as shooting 8 criminal in one scene in the film. Icelandic police in reality rarely carry firearms and as of 2024, there has only been one fatal police shooting in Icelandic history.
Jon Gnarr who plays a fictionalized version of himself, as the Prime Minister of Iceland, was the real life Mayor of Reykjavík between 2010 and 2014.
Director Hannes Þór Halldórsson is a former professional footballer who represented Iceland 77 times, including saving a penalty kick from Lionel Messi in Icelands opening match of the 2018 FIFA World Cup.