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The Dursleys were mean because they were under the effect of a Horcrux
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The Deathly Hallows refers to Voldemort, Snape, and Harry, and Dumbledore's Death.
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Dumbledore is a time-traveling version of Ron Weasley
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There might have been a war between the muggles and wizards, with the muggles being the winner
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There are ghosts of former Hogwarts students that died there
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Draco Malfoy is a werewolf
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Ginny may have given Harry a love potion
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The Defense Against the Dark Arts position was cursed by Voldemort
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Harry is the Heir of Gryffindor
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Moaning Myrtle was an urban legend
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Neville wasn't bad at magic, but he was using the wrong wand
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Harry never left the cupboard under the stairs
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Neville Longbottom is the real hero
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The Sorting Hat sorts students based on what traits they value, not possess
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Harry is now immortal
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Crookshanks is actually the Potters' cat.
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Rita Skeeter is J.K. Rowling
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Dramione (Harry Potter)
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George Weasley is Willy Wonka
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Seamus Finnigan and Dean Thomas are gay for each other
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Dudley saw his bratty and bullying memories with the dementor and it terrified him
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Muggles hated The Fat Friar and Sir Nicholas because they used magic so the two were executed
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Minerva McGonagall is a death eater
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Dumbledore had a horcrux
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Umbridge was muggleborn, but lied about it to avoid arrest
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Crabbe and Goyle have troll ancestors
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Hermione wrote the entire series and then let J.K
Rowling (who she met on a train and felt bad for) have all the credit so that it could be sold as fiction even though every word of it is true.
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Voldemort does know love, he just doesn't want it to ruin his dark personality.
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Crabbe and Goyle are cousins
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Harry, Ron and Hermione asked to be in Gryffindor
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Draco is secretly in love with Hermione
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Felix Felicis is just a legend
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Hedwig is Lily Potter