It is amusing that a show known for it's award winning makeup would overlook a hairdressing detail.

I took him to be seeing something off camera (real or imagined). It didn't occur to me until reading the comments his speaking up would draw zombie attention in and of itself. Rick and Glenn talked during the first guts run. I mean, Rick told Glenn not to draw attention during the first guts run, but he, um, said that…

So people who can nail headshots from moving vehicles from 50 feet away can't be trusted to hit a dude with a hostage standing still 5 feet away? Also, the "guts keep zombies away" thing is only a thing when the plot requires it to be a thing.