- California Doubling: The South Korean government denied the filmmakers permission to shoot at the real-life Gonjiam asylum, so filming took place in an abandoned Busan high school campus instead.
- The Danza: All of the protagonists besides Charlotte use their real-life names.
- Screwed by the Lawyers: The owner of the real-life Gonjiam asylum unsuccessfully tried to have the film's screenings blocked, claiming it would tank the building's selling value. The building was eventually demolished two months after its release.
http://tvtropes.org/pmwiki/pmwiki.php/Trivia/GonjiamHauntedAsylum
FollowingTrivia / Gonjiam: Haunted Asylum
Go To
