Queen:
Re: flash mob...they may not be able to smell too well, but they can see an agitated horse and rider pretty well. Rick scrambled under the tank, but the zombies were already on to him, so of course they would follow him under the tank also.
There were a few other instances of the zombies having supersonic senses of smell, not just that one scene. It's just the first one I could think of, but they went to a lot of trouble early on to establish the zombies having an uncanny sense of smell. And it actually really made the chase/escape exciting, because you knew they wouldn't be able to just....hide under things. That scene of them in the department store covering themselves in zombie carcass was a fantastic one because you knew they had no choice, as horrendous as it was. Now they can just hide under cars a foot away from a huge, shuffling mob? That's weak.
As far as bad writing, I realize this is somewhat of a cop out, but it could be a portrayal of an average person who is not particularly good at putting together a speech. You have to ask yourself is it authentic or not. As far as Carol not acting when she needed to act to save her daughter, then blaming everyone, I can see this happening. As far as zombie corpses, they could have been killed by people stuck in the traffic jam. Mostly I saw vehicles that had either run into others or got stuck in the jam.
Sorry, but that's not how it came off to me. The speeches came off as a cheap way to get in exposition about Rick's headspace. The first one might have been okay to let slide, since it was the opening scene a year after the first season. But the second one was not only clunky, but unnecessary. We knew Rick was starting to lose it with Carol blaming him, and the sniping, and the hopelessness of their situation. It wasn't necessary to have a speech full of on-the-nose dialogue reaffirming it. Instead of hustling out after a little girl lost in zombified woods, he's in there pleading with a statue of Jesus. And this was moments after Carol had already had her own chat with the same statue.
I think Carol would have shouldered more of the blame herself, since she stayed under a car watching her kid get chased by a walker before finally reacting. But I'm not overly invested one way or the other since she's a crappy, one-dimensional character and I sort of hope her and her daughter both croak.
So walkers turned drivers into zombies, which then sat behind the wheel of their car so regular humans could come and kill them off? That doesn't make any sense. Neither does all the flipped over cars. Traffic jam, yes. Fender benders, yes. Autos flipped onto their backs, no.
I may be nitpicking here, but all the little nonsensical things started adding up to me. I think they can do better, and I hope they do.