1.Time-Turners
The magical plot hole in Harry Potter that is most irksome to me is the introduction of time-turners. These magical timepieces are in fact miniature time-travelling devices. Without even going into the possible practical application of such a device in a time that clearly calls for desperate measures, (instead of using them to beef up Hermione’s grades, how about using them to stop the Dark Lord from destroying the world?) why even have them? The only useful thing they are used for is saving Sirius and Buckbeak, but a writer of J.K. caliber should be able to easily come up with a different way of doing it without resorting to time travel.
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