4. Season 2, episode 4: When a throwaway line in episode 1 became the plot of season 2
This is just plain awesome. What was a joke in the very first episode of the show became a major reveal of season two: that it was the clams at Japopo’s that made Sheila a zombie. It was there, all along! It only became clear on another rewatch of the series, so deeply is the line buried, but the callback is a real treat that rewards repeat viewings.

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