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Retroactive continuity is the deliberate changing of previously established facts in a work of serial fiction. The change is informally referred to as a "retcon," and producing a retcon is called "retconning". It should not be confused with a "plot hole", where the internal consistency of a particular story is at fault for not explaining changes in conditions that could reasonably happen (e.g. a character using a weapon they were not described as finding).

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