Did anybody find mistakes or plotholes in Harry Potter movies?

As my observation goes, I had observed one mistake in Harry Potter and the Chamber of Secrets. It is about Moaning Myrtle, which is a ghost and the objects can pass through her i.e. read more

In Harry Potter and The Chamber of Secrets Ron and Harry take polyjuice potion in order to impersonate Crabbe and Goyle. As Harry says though "we still sound like ourselves" so though their appearance has changed, their voice still remains the same. read more

The 6 biggest plot holes in the Harry Potter movies – Time-turners, Elder Wands and sleeping arrangements Some bits were a load of old Hogwarts. read more