Questions?
Why did the infected just freeze in their tracks? (Narcoleptic zombies?)
Why would the miitary make only one pickup a day?
Why wouldn't the military carry supplies to be left on the roof for those who missed the last flight?
Why would they use only one helicopter? Using two would keep one in the air providing cover for the other one to load, and vice versa.
Not a question, but a comment. The ending did suck.