- Depending on the Harry Potter fan, some may completely ignore the epilogue to the last novel, completely ignore the last novel, or completely ignore the last two novels, either in order to "preserve" the characters in the state that they found most attractive or to prevent the characters from ending up in the wrong pairings. There's even a commonly-used Fan Fic abbreviation - EWE, for "Epilogue? What Epilogue?"
- Bizarrely, many authors keep the Epilogue and everything else in canon — and then write fics with alternate ships anyway. Apparently the half-dozen identical children with awful names made something of an impression.
- Though they will admit the truth if pressed, many Potter fans still like to believe that Sirius Black is living happily on a farm somewhere with other animagi.
- Lavender Brown's death was invented for the film, not the book, but J. K. Rowling made it canon later anyway, which fans prefer to ignore.
- Another group of fans accept the books but firmly deny J. K. Rowling any right to discuss what happened to any characters after the end of the books.
- Fanon is somewhat divided on whether or not to take anything said by Rowling in interviews and Q&A sessions as canon, since they've resulted in more than one quite obvious Ass Pull (often in favor of making the series more racially, ethnically, and sexually diverse than it actually was).
- There are some aspects, however, that are almost universally ignored. For instance, there exists all of one major Next Generation fanfiction that acknowledge McGonagall having retired by 2017. And even then she comes back.
- There are a large group of fans who completely ignore anything to do with numbers JK Rowling gives us such as character ages or the number of students at Hogwarts.
- Other fans prefer to ignore Pottermore for the fact that some of the facts listed on there just don't make sense - most infamously, for example, that wizards used to soil themselves and vanish the evidence away before the invention of indoor plumbing.note .
- Charlie Weasley and Bellatrix Lestrange are both famously given specific birth years by JK Rowling that directly contradicts what is stated in the books. In addition, Credence Barebone's given birth year is almost two years after his mother, Kendra Dumbledore, is supposed to have died. However the person who tells Credence his identity is a known liar and manipulator so this might not even be true.
- The Black Family Tree that JK Rowling drew is considered to be non-canon by many fans due to the fact that it contradicts what is written in the books as well as the fact that many characters are described as having children at 13 years old.
- Whether or not Pottermore should be canon for most of the supporting and minor characters, as many fans suspect their biographies were written after the fact. Particularly with regard to aspects never even hinted at in the books.
- Now there's also Harry Potter and the Cursed Child, a Spin-Offspring play written nine years after the series ended, with its script published as the "eighth book." About half of the fans like it, but even many of them won't consider it canon. One of the biggest comments is that it reads like fanfic, filled with Fandom Specific Plots like use of Time Travel that's different than in the novels, the villain being Voldemort and Bellatrix's daughter, and also pulling Ron the Death Eater on Cedric, a character whom fans actually like.
- Some fans, primarily Americans, are reluctant or outright unwilling to consider the worldbuilding notes published on Pottermore as A History of Magic in North America the canon vision for Wizarding America, citing a lack of research into American history and culture. Namely:
- America's wizarding school, Illvermorny, is an Expy of Hogwarts, despite the fact that America doesn't have any of the British traditions regarding boarding schools (nor does it have medieval castles.) Many American fans have chosen to disrgeard Illvermorny and replace it with a schooling system that better fits American culture.
- Like the Black family tree, the American historical record is littered with errors regarding dates. Famously, if Pottermore is to be believed, the American wizarding government was founded nearly a century before America existed, meaning it was named after a country that wouldn't be created for another hundred years. It was also located in Washington, D.C. long before Washington D.C. was founded, and before the city's namesake was even born. Naturally, the canonicity of all the inaccurate and/or historically impossible facts is debated, and many have elected to just ignore them.
- The American wizarding community is generally portrayed stereotypically and, in some fans' eyes, offensively; Native Americans are grouped into one historically inaccurate monoculture, for example, and the narrative explicitly points out that many positive historical events, like the founding of Illvermorny, only happened because of Europeans. Many fans ignore this and create their own histories for wizarding America.
- As the Philosopher's Stone is a Public Domain Artifact, even US readers tend to ignore the Market-Based Title of the first book, not least because they find the reason the name was changed to be insulting to their intelligence and that of their entire country.
Discontinuity / Harry Potter