Even though Rendel: Cycle of Revenge (Rendel 2) takes place in Mikkeli, no actual filming was done there. Filming was done in Kainuu region and Jyväskylä.
About one third of the film was shot in studio facilities set up at a local vocational college in Kajaani, Finland. Studio sets include main villain Smiley's office, laboratories and offices.
1st assistant director Milla Karjalainen always used Finnish-English commands "Let's mennään" ("Let's roll") or "Let's kuvataan" ("Let's shoot") before new take.
Bruce Payne literally left a piece of himself to Finland while filming Rendel 2. Kris Gummerus accidentally sliced a small piece of Mr. Payne's finger off during a scene.
Director Jesse Haaja made a cameo as a waiter. Shots with Haaja were directed by his fiance Bianca Bradey. Slate number was 666.