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Retroactive continuity is similar to, but not the same as, plot inconsistencies introduced accidentally or through lack of concern for continuity; retconning is done deliberately. For example, the ongoing continuity contradictions on episodic TV series such as The Simpsons (in which the timeline of the family's history must be continually shifted forward to explain them not getting any older. For instance, when the series started, Bart would have to have been born in about 1980, but that would make him 32 years old as of 2012) reflects intentionally lost continuity, not genuine retcons. However, in series with generally tight continuity, retcons are sometimes created after the fact to explain continuity errors.
Retconning is also generally distinct from replacing the actor who plays a part in an ongoing series, which is more commonly an example of loose continuity rather than retroactively changing past continuity. The different appearance of the character is either ignored (as was done with the character of Darrin Stephens on the television series Bewitched, Vivian on The Fresh Prince of Bel-Air, or Claire on My Wife and Kids), or explained within the series, such as with "regeneration" in Doctor Who, or the Oracle in The Matrix Revolutions.
It also differs from direct revision. For example, when George Lucas re-edited the original Star Wars trilogy, he made changes directly to the source material, rather than introducing new source material that contradicted the contents of previous material.
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