11Azkaban Tattoo

In Harry Potter and the Deathly Hallows - Part 2, Lucius Malfoy’s Azkaban prisoner number tattoo can be seen on his neck for a brief moment. After Order of the Phoenix, he and other Death Eaters were arrested after they were caught in the Ministry. He only gets out when Voldemort started to take more power by Deathly Hallows.
12Professor Slughorn

In Harry Potter and the Deathly Hallows - Part 2, when all the professors leave the castle to cast the defensive shield, Professor Slughorn can be seen drinking a bottle of what looks like liquid luck.
13Dursleys

In Harry Potter and the Philosopher’s Stone, the Dursleys and all their neighbors own the exact same make and model of car, in an effort to be as normal as possible and blend in with everyone around them.
14Remembrall

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.
15Snape’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.
16School 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.
17Lucius 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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18Ian 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.
19Marauder’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.
20Dobby 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.



