Other mistake: When the crew is isolating the boiler in the Pendelton, the pipe wrench on the isolating valve is on backwards for the direction it is being turned.
Other mistake: Kevin Costner is billed in the credits as "Jerico Stewart." His prison file though spells his name everywhere as "Jerico Steward", with a D. (00:12:00)
Other mistake: Alice is running behind the armored cars. Once she manages to get on top of the car, suddenly the zombies that were only behind her and nowhere near the car are found at the sides too, attacking a guard and later Alice as well. Not possible considering if zombies were able to get there, they would have killed Alice while she was running.