Designated Hero: The review at the end of the book by another author In-Universe accuses Robert Sobel of making the CNA this.
Designated Villain: The in-universe review at the end accuses Sobel of making the Mexico this.
Fanon: Most of the maps, the constitution and other expansions from the original text that are featured in the above site.
Fanon Discontinuity: The map that comes with the book in some editions has been subject to this in some circles.
Fandom VIP: Johnny Pez, the founder of the Sobel Wiki who generates a large portion of its content. He also regularly blogs about the book in-depth, in addition to his fan fiction.
Fridge Logic: As this post notes, the butterfly effect should have prevented Henry Gilpin's parents from meeting, considering they were 3000+ miles apart before the 1790s and met by chance in Lancaster.
It's also noted here here that Governor-General Bruce Hogg has impeachment measures drawn up against him, despite this being a parliamentary form of government wherein the vote of no confidence is clearly addressed earlier on. Similar problems exist with the surprisingly stable minority governments of John McDowell and Ezra Gullivan.
Genius Bonus: "Chapultapec", "Conceptión" and "Guatamala" may seem like outdated misspellings of the corresponding Spanish terms, but they may actually reflect the In-Universe Robert Sobel's bias in favor of the Anglos in Mexico. This is why the Sobel Wiki uses different spellings, as delineated here: (http://johnnypez9.blogspot.com/2013/07/sobel-wiki-shibboleth.html ).
Hilarious in Hindsight: Jimmy Carter would become president three years after the publication of the book, and some people have noted (unflattering) parallels between him and Governor-General Mason.
notes, the butterfly effect should have prevented Henry Gilpin's parents from meeting, considering they were 3000+ miles apart before the 1790s and met by chance in Lancaster.