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1. In The Sorcerer's Stone, Harry’s classmate Neville Longbottom is gifted a remembrall sent from his grandmother. but Neville says that he can’t think of what he’s forgotten. Notice, he's the only one not wearing his cloak.

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2. In this scene from early on in the movie, Aunt Petunia is dyeing Dudley's old school uniforms grey for Harry to use at school. This was never said aloud, but is a scene from the books.

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3. In The Sorcerer's Stone, Harry's scar begins to burn when Snape is looking at him, leading Harry to believe Snape is evil. In fact, his scar is burning because he is facing Voldemort — who's covered by Quirrell's turban.

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4. In The Chamber of Secrets, you can see very clearly how Ron's clothes are much 'greyer' and more beaten down than every other students'. This is because Ron's clothes are hand-me-downs from his older brothers and everyone else was bought new robes.

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5. In The Half-Blood Prince , you can see The Horcrux cave in Tom Riddle's bedroom

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6. You can also see seven stones precariously placed on Tom's windowsill, foreshadowing that he's going to split his soul into seven Horcruxes.

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7.  In Deathly Hallows Part 2, Snape is still fighting for Dumbledore. You can see Snape knock out two Death Eaters when he fights McGonnagall

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8. In The Chamber of Secrets, In the scene where Hagrid finds Harry, you can see that the shop’s display case actually shows hardcover copies of J.K. Rowling’s Harry Potter novels in the window.

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9. In The Half-Blood Prince,  you can spot a box of "Cheeri-Owls" on the dining hall tables, a spoof of Cheerios.

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10. The trophy case houses both the trophy from James Potter’s stint on the Gryffindor Quidditch team as well as Tom Riddle’s award for Services to the School.

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