1Tom Riddle's Diary
At the beginning of Harry Potter and the Chamber of Secrets, Lucius Malfoy takes a book out of Ginny’s cauldron but when he puts it back you can see that he puts Tom Riddle's diary in the cauldron as well. There is even an inkling of confusion in Harry's face but he doesn't quite understand why. This detail is explained at the end of the movie, but people usually miss it at the beginning.
2Horcrux Cave
When Dumbledore visits a young Tom Riddle in Harry Potter and the Half-Blood Prince, there is a picture of the cave where Tom hid one of his Horcrux. There is also a brief close up that shows 7 rocks meticulously organized on Tom’s windowsill, foreshadowing Voldemort’s plan to split his soul into seven Horcruxes.
3Horace Slughorn
In Harry Potter and the Half-Blood Prince, while Horace Slughorn is disguised as an armchair, you can visibly see his feet.
4Dobby and Winky
In Harry Potter and the Goblet of Fire, scenes featuring elves Dobby and Winky were cut due to time constraints. However, if you watch carefully in the first campsite scene, right after Ginny points to something and says "Look!" you can see two House Elves riding on llamas.
5Marauder’s Map
In the credits of Harry Potter and the Prisoner of Azkaban, the producers placed a naughty Easter egg in the Marauder’s Map. In one scene, two sets of footprints can be seen in the bottom left corner representing two people either having sex or making out. Also, when the Map is opened for the first time, the name 'Newt Scamander' can be seen. Scamander wrote the book “Fantastic Beasts and Where To Find Them” that is mandatory reading at Hogwarts, but he isn't a teacher there. Scamander eventually got his own movie with “Fantastic Beasts and Where to Find Them”, where it is revealed that he is friends with Albus Dumbledore, so in 'Harry Potter and the Prisoner of Azkaban', he may be simply visiting.
6Ian Brown
In Harry Potter and the Prisoner of Azkaban, a wizard played by Ian Brown from the band “The Stone Roses” is seen reading the book ‘A brief history of time’ by Stephen Hawking in the Leaky Cauldron, foreshadowing time travel that takes place later in the movie.
7Lucius Malfoy
In Harry Potter and the Chamber of Secrets, Lucius Malfoy attempts to cast Avada Kedavra on Harry after being tricked into freeing Dobby. It wasn’t explained in the movies at that point that this spell instantly kills a person. So Lucius was literally about to murder Harry in the middle of Hogwarts.
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8School roosters
In Harry Potter and the Chamber of Secrets, when Hagrid charges into Dumbledore's office to defend Harry, he is seen carrying a dead rooster in his hands. In the extended cut of the movie, Hagrid mentions that someone is killing the school roosters. In the harry potter lore, the sound of a rooster is fatal to a basilisk. That’s why Ginny killed them under Tom Riddle’s control. It was also the rooster’s blood that was used to write on the walls.
9Snape’s question
Snape’s first question to Harry in the Philosopher’s Stone in his potions class is: “What would I get if I added powdered root of asphodel to an infusion of wormwood?” Asphodel is a type of lily and in the language of flowers, it means ‘remembered beyond the tomb’ or ‘my regrets follow you to the grave’ while wormwood is often associated with regret or bitterness. This suggests that Snape deeply regrets Lily Potter’s death.
10Remembrall
In Harry Potter and the Philosopher’s Stone, when Neville gets a Remembrall, he says he doesn’t know what he has forgotten. If you look closely, he is the only student on the table who is in a sweater and has most likely forgotten his robes.
