Herzog is described and credited as a Colonel. However, he wears a cap with a Totenkopf insignia, making him a member of the Totenkopfverbände (since 1941 part of the Waffen-SS). In the SS, he would have been addressed as Standartenführer.
One of the zombies (one of the two chasing the girl up the tree) is wearing a white (snow) camouflage jacket. The jacket shows plastic parts (or is completely made out of plastic) which can only be found at modern day jackets. Maybe the zombie took it away from a earlier victim but as all the others wear "original" war gear this is supposed to be a WWII Jacket - and is way too modern.