The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at You Know, That Thing Where.
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In which the writers of a sequel/spin-off/reboot/what have you mistake something that's fanon (most likely an unsourced edit from a wiki or something similar) for actual canonical information, and end up introducing it into continuity. Obviously mainly applies to works in Long Runner franchises in which the original creator(s) aren't involved.