I did find this that answered my question about the head moving: Newman watch it again to see what I’m talking about.
They never explained how one of the zombies made the manniquin Frank move it’s head and why Will’s character, a top scientist, wouldn’t notice a rope hanging from above this obvious trap.
"The Darkseekers did not make the manniquin move, it was in Neville’s head. The rope was hidden along the a ground and in the pool of water. It was not easy to see and remember that Neville had started to go a bit crazy from being alone. There is a bit of psychological trauma when everyone you ever knew is dead and when you think you are the last man on Earth "
And with all the people that lived in New York at the time (2009), what happened to the millions of bodies? There would have been rotting bodies and bones all over the city still 3 years later…
"Some escaped, some where buried in Central Park ( as shown in newspaper articles,) and the rest were eaten. The Darkseekers were eating everything in site to accommodate their hyper metabolism. "
Also, how about explaining what the liquid he squirts at his door is? Vinegar, bleech, rubbing alcohol? I can figure out why, but why not explain it?
"It was to mask his scent and looked like scented cleaning fluid "
How did the woman and kid drive to manhatten? Didn’t they show the jets destroying the bridges to stop the infection spread? wouldn’t they have done this to all of them within the following 2 or 3 months?
“No offense, but you must not be from NY. There are plenty of ways to get to Manhattan that do not involve bridges”