- Actor Allusion: When discussing Lucky Star Taniguchi mentions that Konata's voice creeps him out for some reason—most likely because it's so similar to Haruhi's.
- Similarly, in "Epileptic Plot Tree", Haruhi bites the head off a chocolate cornet (whichever end that might be).
- Ascended Fanon: Naming Kyon's Morph Weapons Altair and Vega after Tanabata was proposed in the WMG page.
- Author Existence Failure: Sadly, the author, Brian Randall, committed suicide on January 17th, 2014. He will be missed.
- Fan Nickname: Anything related to the fic is bound to be called "Big Damn X".
- For example, the "Big Damn Harem" which consists currently of all of the girls of the SOS Brigade, and the Big Damn VN Brigade who are the people responsible for making the Kinetic Novel.
- Jossed: The tenth and eleventh novels Jossed pretty much everything introduced for this fic, including the motivations of certain characters and absolutely everything about the O.C. Stand-in. Fortunately, the writer always intended Big Damn Hero to be an Alternate Universe Fic, so he is still writing it regardless of these setbacks.
- Recent chapters seem to be written around novels 10 and 11 to a degree, slipping in details from the novels that the fic hadn't previously contradicted (like Sasaki previously going to Haruhi's elementary school) and explaining away at least one contradiction despite the alternate universe premise (Koizumi mentions that Tachibana was under the mistaken impression that he was the Organization's leader).
- Why Fandom Can't Have Nice Things: Played straight and inverted at the same time: the reason that Durandall has left Fan Fiction Dot Net, and thus stopped posting new chapters and reviewing fan fiction there, is because of the criticism of his viewpoints in his reviews towards other fanfic authors on the site.
- Word of Dante: The story explicitly says that the city where the events from The Melancholy of Haruhi Suzumiya take place is Nishinomiya, Hyogo Prefecture, a fact well known by the Fanon but left out of official material.
Trivia / Kyon: Big Damn Hero