12 Huge Problems With Harry Potter Movies (Nobody Admits)
6. Helena Ravenclaw And The Location Of The Diadem – The Deathly Hallows Part 2
Towards the end of the second part of The Deathly Hallows, Helena Ravenclaw tells Harry the diadem is located in ‘the place where everything is hidden’ – the Room of Requirement. But how would she know this? It’s very unlikely that Voldemort told her because he was so protective over his Horcruxes.
The book version of events – though more complex – is much more satisfactory. Back in The Half-Blood Prince, Harry is shown a memory which involves Tom Riddle asking Dumbledore for a job. Later on, Harry hides his copy of Advanced Potion Making in the Room of Requirement, and – purely by chance – he covers the hiding place with a wig and a tiara to make it more distinctive.
After speaking with Helena during the Battle of Hogwarts, Harry comes to the sudden realisation that Voldemort hid the diadem the night he asked Dumbledore for a job and that the ‘tiara’ he’d used to hide his Potions book the previous year was in fact the diadem.
Granted, there is a fair bit of luck involved with such a revelation, but at least there’s a reasonable explanation given. Whereas in the movie, we’re just supposed to accept the fact Helena knows where Voldemort hid her mother’s diadem.