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I've read a few books that had an "afterword" section at the end, where the author would address the reader directly to talk about the work. I know Anthony Horowitz did this with the Alex Rider ser...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46733 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I've read a few books that had an "afterword" section at the end, where the author would address the reader directly to talk about the work. I know Anthony Horowitz did this with the Alex Rider series; one book had him list his top 10 favourite deaths across the whole series, and I think another had him discuss his decision to have _Scorpia_ end with > Alex getting shot by a sniper. So you could always add an afterword at the end of your own novel, and in there, you could explain how you knew that X was unrealistic or incorrect, but you put it in anyway for artistic license. This relies on your readers actually reading the afterword and not just closing the book the minute they finish the actual narrative, but it's the best way I can think of.