As with previous installments Das Tal der toten Mädchen (2017) and Das Tal der vergessenen Kinder (2019), the film was set to premiere theatrically in Spain (on March 27th 2020), followed by a streaming release in other countries through Netflix. However, due to the COVID-19 pandemic, it premiered on Netflix worldwide, including Spain.
Benn Northover, who plays Amaia's American boyfriend, James, is actually from Suffolk, England. This explains his distracting delivery, peculiar word choice and unusual cadence.