Aparently a major point is that the book covers many many individual accounts of the events and the movie is only following one guy.

Never read the book so this is only hearsay so can any of you varify this?

Rather than a grand overview or narrative, World War Z is a collection of individual accounts in the form of first-person anecdotes. Brooks plays the role of an agent of the United Nations Postwar Commission, who published the report a decade after the ten-year Zombie War. The United Nations left much of his research out of the official report, choosing to focus on facts and figures from the war rather than the individual stories that form the bulk of Brooks' novel. The interviews chart a decade-long war against zombies from the view point of many different people of various nationalities. The personal accounts also describe the changing religious, geo-political, and environmental aftermath of the Zombie War.

Voice in Pacific Rim sounds like Glados

Im guessing the major point is that zombies require a headshot to be killed and landing that would be pretty difficult in most situations (unless sniping stationary targets from afar, accurate scope of course etc).

the problem was ammo vs numbers.

Thats not to say they couldnt get here because my understanding of the story is that some zombies actually moved through bodies of water.

Respiration

The lungs of the undead continue to function in that they draw air into and expel it from the body. This function accounts for a zombie's signature moan. What the lungs and body chemistry fail to accomplish, however, is to extract oxygen and remove carbon dioxide. Given that Solanum obviates the need for both of these functions, the entire human respiratory system is obsolete in the body of a ghoul. This explains how the living dead can "walk underwater" or survive in environments lethal to humans. Their brains, as noted earlier, are oxygen independent. -related note: At the end of the Battle of Yonkers, a themobaric weapon was detonated to cover the U.S. Army's retreat. A morbidly interesting after-effect is that those zombies present who were not outright destroyed by the bomb had their lungs pulled inside out through their mouths as a result of the bomb's implosion. When the U.S. later retook the New York area, they found hundreds of zombies oblivious to their lungs dangling out of their mouths, unable to moan