'Quackery' is a term used to refer to theories or facts that don't have actual basis in the story such as fan theories or trivia. Not to say that these are bad, but rather that they need a separate section in the encyclopedic pages so as to not confuse readers. Now while some things are reasonable, there are a few things that aren't correct in Quackery. These are listed in the following:
Opinions of readers or writers that happen to differ from their character's side in the story shouldn't be noted. It is only natural that people will like certain creatures or a character's personality/role in the story, but not necessarily have their character be a role working with that side. Listing this as a fact only serves to over-inflate the size of articles. It's pointless. Don't do it.