[Miscguy]

I think everyone looks over the fact that in signs the aliens are so "weak" they have trouble with a table tilted agaisnt a door. Or wouldnt bring anything capible of knocking a board off a window, such as a simple crow bar, or hell, a led pipe from the shed. Sure "they wont use there technoligy for fear we'll use nuclear weapons", but a crow bar aint exactally intergalactic technology.

YET, at the end of the movie an alien is holding a 70 - 80 pound child WITH ONE ARM. Just one of many slip ups.