1. The film is in Korean, but director Bong Joon Ho wrote the script in English first before translating it to Korean.
2. The Parks' house was specifically built for the movie on an empty lot. It was demolished after filming completed.
3. Ki-woo was originally going to be the parasite that infiltrated the rich family, but the director changed it to focus more on the Kim family dynamic.
4. The flooding scene used over 11,000 gallons of water and took a week to shoot.
5. The rock used to hit the housekeeper on the head was real. Actors had to be careful not to actually hurt each other.
6. Composer Jung Jaeil created over 80 different versions of the main theme.
7. The car scene where the Kims push the Parks' car took over 40 takes to get right.
8. Costume designer Choi Se yeon created unique outfits for each character to showcase their personalities.
9. The homes were purposefully designed to contrast the rich and poor families.
10. Director Bong Joon Ho had the actors live in the cramped Kim family apartment prior to filming to experience the space.