Actual errors like this are called Flints, by the way, named after the character in the first books who somehow attended Hogwarts for an extra year due to an error by Rowling.

• 类似这样的失误可谓是硬伤，这个在先前的小说里就已经出现的角色，平白无故在霍格沃茨多上了一年学，只能归咎于罗琳自己的疏忽。