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).
- The 2019 Resident Evil 2 remake establishes that the Raccoon Police Station was established in 1969 following the purchase of an art museum. The Resident Evil Outbreak File #2 file, "Marvin's memo", instead describes the museum being purchased in the late 1980s.