"One might think that Aunt Petunia is cooking in this scene. But she is actually dyeing Dudley’s old clothes grey for Harry’s uniform. This is only ever mentioned in the first book."
In the third part, when Hermione appeared in class out of nowhere, we can actually see her time turner around her neck which she
hides in the next shot.
The hug that Voldemort gave to Draco, in
Harry Potter and the Deathly Hallows Part 2, was entirely
improvised. Hence the awkwardness from both actors.
In
Harry Potter and the Prisoner of Azkaban, the woman and baby in the painting on the left
are actually the wife and daughter of director Alfonso Cuarón.
In
Harry Potter and the Half-Blood Prince, Slughorn’s shoes are clearly still visible when he
disguises himself as an armchair.
Nigel Anstey, the grandfather of Tom Felton (Draco Malfoy), has an uncredited
cameo appearance as an unnamed Hogwarts professor in the first part.
In the final shot of the film, Harry’s scar is noticeably faded and barely visible. It’s the
reference to the last line of the novel series, “The scar had not pained Harry for 19 years. All was well.”
Ralph Fiennes (Lord Voldemort)
asked for a hook to be added to Voldemort’s wand so that he could move more fluidly and “snake-like” without the wand falling from his hand.
When Lockhart unleashes the pixies, Hermione immediately
throws her books to the ground while no one else does because she knows the pixies will rip anything in plain sight apart.
In
Harry Potter and the Sorcerer’s Stone, Harry’s scar burns when Snape looks at him when actually it is Voldemort because Quirrell has his head
turned.
The roles of some members of the in-universe band,
Weird Sisters, were
played by the musicians of Radiohead, Pulp, All Seeing I, etc.
In
Harry Potter and the Deathly Hallows — Part I, Dobby dies by breaking the promise he
made to Harry in the second movie to "never try to save his life again.
In
Harry Potter and the Sorcerer’s Stone, when Fred and George try to confuse their mom, you
can see their correct initials on their trunks.
In the second movie, Nearly Headless Nick
greets Percy Weasley and Penelope Clearwater who are walking closely together. In the book, Ginny reveals she’d discovered that these 2 have a romantic relationship.
The end of the handle of Professor Slughorn’s wand is in the
shape of the horns of a slug which corresponds to his name.
In the first part of the franchise, the Dursleys and all their neighbors own the exact
same make and model of car, in an effort to be as normal as possible.
When everyone is submitting their names, we can see Neville already
reading the book that he will use to help Harry with the second task.
The harp used to put Fluffy to sleep in the first movie can be
seen next to the Vanishing Cabinet in the Room of Requirement when Harry and Ginny get rid of the Prince’s Potions Book.
In Harry Potter and the Deathly Hallows Part 1, the photo of the muggle family in the newspaper
isn’t moving like the rest of the photos in that paper. This is because that photo was taken with a muggle camera.
The sign for The Leaky Cauldron is completely black but reveals itself when Harry and Hagrid
approach — that is when a wizard passes it (keeping it secret from Muggles).
