Plot hole: The poison is in the dog collar. Anson gets the poison from touching the collar. Why didn't the dog get any poison from the collar?
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Suggested correction: The poison cannot penetrate the skin as dogs don't have sweat glands on their bodies (except on the paws).
Plot hole: This series depicts Dexter and Harry working together at Miami Metro. However, the original series established that Harry died before Dexter ever started working at Miami Metro.