The Walking Dead fans spot glaring error in Rick Grimes return: 'No way it can be there'

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Maggie King added: “All due respect...you are nit-picking at a show (that I happen to love) that is about the zombie apocalypse...not exactly based in reality so…”

And @PlatinumSteelZ suggested: “They can just say CRM built it.”

After their brief yet intriguing appearance in the series finale, both Rick and Michonne are set to return for their own spin-off show in the near future.

Perhaps the sequel will reveal why Philadelphia looked suspiciously modern in the closing scenes but, until then, fans have been left scratching their heads over another Walking Dead mystery.

The Walking Dead seasons 1-11 are available to stream on Disney+ in the UK.