Walking Dead's Smart Zombies Are A Season 1 Plot Hole

The Walking Dead's zombies are the usual brainless decaying types, but that wasn't always the case. Over time, the undead have got dumber.

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Why did the Walking Dead zombies seem more intelligent in Episode 1? - Quora

Where is The Walking Dead Season 5? : r/telltale

The walkers s1 seemed to be way smarter ? they used a brick for the door now that cant even walk past a brick.. : r/thewalkingdead

Why haven't the zombies in The Walking Dead deteriorated completely after such a long period of time? - Quora