I wouldn’t count this in Random Silly Grins, although certainly it is silly.
I’ve managed to spot a few of Rowling’s literary sources over the years. In the Name of the Rose has a herbalist monk named Severus, and the monks of his order drink pumpkin juice. The monastery itself is like a giant stone puzzle, and may have inspired some of the descriptions of Hogwarts. I think I’ve spotted some influences from John Le Carre’s George Smiley novels too.
She pulls from British folklore as well, but since those don’t trace back to a single book usually I don’t always catch those.
I’ve never had the stomach to read the Malleus Maleficarum, the infamous witchfinder book first published in the 15th century, but whenever this sort of thing comes up, I think Rowling must have at least browsed it.
“These books present magic as both good and evil, which is not true, but in fact a clever deception,” Rev Dan Reehil wrote. “The curses and spells used in the books are actual curses and spells; which when read by a human being risk conjuring evil spirits into the presence of the person reading the text.”
A Catholic can’t claim this with a straight face unless they’re referring to the Malleus, pretty much. Bad news for Rev Reehil: the authors made that shit up. So if Rowling used it as a reference for curse and spell names (possible, since all her terms sound Latin-ish), they’re going to sound “real” to anyone credulous enough to take the Malleus at its word.
And I can’t find a reference on-line, but I know I’ve been told/have read more than once that it was discovered in the 19th century that their permission to publish was discovered to be a forgery. That is, they never had papal blessing.
Even if they did publish with permission, their claims about witches have been contested nearly since the first publication. From a scholarly point of view, it seems to be much more interesting for the attitudes it captures and the damage it did than for any actual witch behaviour it captures.