I can't think of anything I've completely excised from my fanon, and I'm not sure if I have or not. I mostly do Revision
retcons so that what we saw happened, but it wasn't what we thought.
However, the only example that comes to mind is the gymnastics I've gone through to try to get Enterprise
to not be real history. I wanted it to be the history of the Mirror Universe (an extension of an idea by William Shatner or his co-writers, actuallyfull story
), but they did a Mirror Universe episode, so I have to adjust.
The final episode is framed as Riker mucking about on the Holodeck in a recreation of Enterprise events. It'd be simple enough to say that the adventures of Capt. Archer's crew were heavily embellished holonovels, but sometimes I feel that's too good for the show. If I want to go the distance
, I consider the possibility that the Mirror Universe episode was pure fiction on the part of the holonovelist, who was a refugee from the Mirror Universe and otherwise writing a serial that was only a lightly embellished history of his home timeline, but sold as a historical fiction. The MU story was written about the Prime universe's stereotypes of the Empire in response to popular demand.