This will be a minor complaint, not something that ruins the show or anything, but something I could do without is the scene in every episode where a single walker comes out of the forest and gets killed after five seconds. Literally every episode has one or two scenes like that. I understand that these kind of situations occur in a zombie apocalypse, and that the group surely ends up in many situations where they are out walking, a single walker appears and they take care of it. But, in the end it gets pretty mundane. The walker is never a threat, and there's really no purpose to those scenes other than establishing that this is a routine for the group. I don't know, to me it just comes off as filler, like "we need a zombie here to remind people this is the apocalypse".
Just a minor complaint like I said, nothing that takes me out of the show, but I feel like they could decrease the amount of those scenes. There's nothing exciting about them, they usually have no purpose and they're just an excuse to show off a zombie. Unless the scene leads to something or has a purpose, I don't really care for those routine zombie appearances.