Shot in both Norwegian and English.
The one legged zombie in the medic scene is an actual amputee and provided the effects team with one of his own prosthetic legs to be torn apart used as a base for the shredded stump since creating a prosthetic that allowed for the insertion of a plunger and could support the actors weight from scrap proved difficult.
Ørjan Gamst and co-star Tage Guddingsmo played together in the Norwegian death metal band "Slogstorm" for several years. Both eventually dropped out of the band.
The Tiger tank used in the film is actually a replica and not a genuine Tiger. It is a modified T-55
When Monica and the group from the U.S. encounter Martin, she uses these two lines from Star Wars when referring to Martin: "The Force is strong with this one" and "He is our only hope."