Acceptable Political Targets: The progressive politicians of the CNA can often err to obviously quixotic idealism, especially Governor-General Mason.
Big Name Fan: 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.
Critical Research Failure: The conspicuous omission of the Hudson Bay Company in the description of Manitoba, and the anachronistic names for some of the Mexican states (e.g. Arizona) among other things.
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.
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.