| An abandoned hospital in , Germany, served as a location for many of the hospital interiors | The German actors used in the scene in which Lockhart is assaulted by elderly people had no prior experience in film acting |
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| Hannah saves Lockhart by killing her father, who falls into the aquifer and is eaten by the eels | Lockhart attempts to escape the center but finds no one is allowed to leave |
The film trailer also gained media attention for showing a scene where Mia Goth was in a bathtub full of eels.
4| Occupying one tower is a big-league financial services company at which one man mysteriously dies on the job late one night, while CEO Harold Pembroke Harry Groener has taken off for Switzerland just as some legal guano has hit the fan | In an era where Blumhouse is punching out quality films below 10 million, you need to aim for a similar bar |
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| Hannah has her first menstruation, and Volmer marries her | Lockhart sets Volmer and the castle on fire, but is overpowered by Volmer |
The motives and rationales for all the nastiness and deceit and foul play could scarcely be sillier and less convincing, nor could the rooting interest on behalf of the alleged protagonists be more shallow.