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- Hermione Granger's hair is brown in the books. Emma Watson's hair could be described as light golden brown or as dark honey/caramel blonde. In the film of Harry Potter and the Order of the Phoenix Hermione's hair is especially blonde, because Emma Watson had dyed it that way for Ballet Shoes.
- A mild example; Tonks can change her hair at will and usually favors it pink in the books. In the film Harry Potter and the Order of the Phoenix its mostly purple (but turns red when she gets angry, and white when she apparates), which is only at the start of the book. The reason for the change was because pink was already associated with Umbridge in the film.
- Luna Lovegood's hair is described as "dirty-blonde" in Harry Potter and the Order of the Phoenix. In the movies it is platinum blonde.
- Dudley Dursley went from blond in the books to dark-brown/black in the films.
- Aunt Petunia's hair is also changed from blonde to dark brown.
- Young James Potter has brown hair in the fifth movie.
- Neville Longbottom is supposed to be blond according to Word of God, but this was never mentioned in the books. Thus he was cast as a brunet in the movies, which seems to be the dominant mental image fans all have of him. He was also supposed to be short and chubby - then Matthew Lewis shed his puppy fat and made like a beanstalk....
- Minerva McGonagall is introduced as black-haired in the books, but is portrayed by Maggie Smith and her natural greying blond hair. We must assume that her students are even more dreadful in the films.
- Alastor "Mad-Eye" Moody has solid gray hair in the books, in the films he has graying strawberry blond hair.
- Horace Slughorn is strawberry blond in flashbacks to him as a younger man in Half Blood Prince, but his younger self is black haired in the film.
- Cormac MacLaggen is the other way around; black haired in the books and blond in the films.
- Firenze the centaur, described in the book as blond with a palomino body (i.e. quite light overall) becomes pitch-black in the movie. This is probably because blond hair is harder to animate with computer graphics.
- In the Harry Potter games for Game Boy Color, Professor Sprout is a redhead and her hairstyle is different from other adaptations.
- Dumbledore is described as having has dark red hair in his youth but brunette Jude Law plays him in the Fantastic Beasts series.
- Barty Crouch Jr. is described in the book as having straw-colored hair, but David Tennant keeps his natural dark brown hair.
- Ron Weasley's eyes are blue while Rupert Grint's eyes are a blueish green.
- Ginny Weasley's eyes are described as brown in the books while they are Bonnie Wright's natural blue in the films.
- Young Lily Potter's eyes are brown in The Prince's Tale during Harry Potter and the Deathly Hallows, despite the adult actress having blue eyes. In other words, Lily and Harry have both had an Adaptation Dye Job, and Lily had one twice.
- While Lord Voldemort's eyes are mentioned to be red in the books, Ralph Fiennes' natural blue eyes are used in the films. This was done because the filmmakers believed that "if you don't leave in a huge part of the human in him, he's not going to scare you."
- Harry Potter's eye colour changes from green in the books to blue in the films. Daniel Radcliffe's natural eye colour is blue and they tried to give him green contacts to match the books' description of Harry, but they were too uncomfortable for him to wear. Radcliffe's hair is also dark brown instead of jet black like Harry in the books. This is particularly egregious because people are constantly mentioning that Harry has his mother's (green) eyes and otherwise, looks like the spitting image of his father.
- This does mean that Harry shares his eye colour with his mother's adult actress, but rather glaringly, not her child actress who even has a close up of her undeniably brown eyes.
- A number of dress robes changed color and design from the book Harry Potter and the Goblet of Fire to the film of The Goblet of Fire, most glaringly Hermione's periwinkle blue dress becomes pink (because the costumers thought blue didn't look good on Emma Watson), Harry's bottle green dress robes become black with a white collared shirt, and Ron's maroon velvet robes trimmed in lace become multicolored brown with pinkish lace, an off-white frilled shirt and a fraying green bowtie.