Just going back to the episode 2 action scene lacking character art detail, look up
Takashi Mukouda, the animator. You'll see a lot of action scene's with a similar lack of character detail. That's his style.
Now, I'm not saying you should like it. It's just that, as duckroll said, Watanabe seems to be giving the animators a lot of freedom with this series, and this will result in different styles of animation coming together in episodes.
Not everything you dislike is rushed or downgraded because of budget or something, a lot of it is stylistic choices/differences.
Regarding the latest episode and the gif posted above, that's definitely a stylistic choice. All the zombies are generally designed to look droopy, and that's what Meow's design seems to be conforming to. Just compare it with other scenes depicting zombies: