That in almost every Zombie movie, the people in the movie, civilians and military, seem to never have seen a Zombie movie before?
They act confused to what is going on instead of saying "This reminds me of The Night of the Living Dead"...
I really don't know and it does bug me. Vampire films, werewolves, sea monster... even alien films all know the basic makeup of the 'monster'.
For some reason Zombie films always seem to have the characters go in blind in some kind of alternate universe. that said though in this film they did use the word Zombie and some idea.