1.賈斯廷沒有買書嗎？
本書在第六章提過，麥格教授讓小巫師去挑魔杖，而家長則跟著她去買其他入學用品。
“我們先去摩金夫人那兒，將孩子們長袍買好。然后讓孩子們去挑魔杖，可能得花點兒時間，家長們正好跟我去買其余的東西。”
2.級長。
來自哈利波特維基：
A prefect at Hogwarts School of Witchcraft and Wizardry was a student who had been given extra authority and responsibilities by the Head of House and Headmaster. One male and one female student were chosen from each house in their fifth year to act as prefects. They would continue to be prefects in their sixth and seventh years until they left school.
Thus， there were approximately six prefects per house and twenty-four prefects in the whole school at one time. Prefects could become Head Boy or Girl， and would still serve as prefect as well. Being a prefect didn't guarantee a student to become a Head Boy or Girl， in fact， the Head Boy or Girl did not have to have been a prefect at all.
由此可知，每個學院會在五年級時挑選一位男生和一位女生擔任級長職務，一個學院可能同時存在6名級長（從五年級到七年級各兩名），而不是每個年級都有兩位級長。
七年級的級長畢業后，會有兩名新的級長從五年級學生中誕生，所以可以被稱為“接替”。
另外，學生會主席更容易從級長中誕生，也可以不是級長，如詹姆·波特。
3.伊頓公學。
原著第二部哈利·波特與密室第五章“吉德羅·洛哈特”提到，賈斯廷·芬列里原本是要去伊頓公學的，并非是我杜撰。
原文如下：
“那個叫什么洛哈特的，”他們開始往花盆里裝火龍糞堆肥時，賈斯廷興致勃勃地說，“真是個勇敢的人。你們看了他的書沒有？我要是被一個狼人堵在電話亭里，早就嚇死了，他卻那么鎮靜——嘖嘖——真了不起。
“我本來是要上伊頓公學的，但后來上了這里，我別提多高興了。當然，我媽媽有點失望，可是我讓她讀了洛哈特的書之后，我想她已經開始看到家里有個訓練有素的巫師是多么有用……”