Oyster card panels which launched by year 2003 are clearly visible in the London underground scene which is an anachronism.
Cho Chang is referenced to being in Harry's year, whereas she is actually in the year above him.
There is a flatscreen TV in the Dursleys' house, clearly another anachronism.
On the radio, Cornelius Fudge said that the Ministry was blaming Sirius Black for the mass break out, when in the series it was revealed that they realized that Sirius was innocent.
Omissions
thumb|300px|right|Harry Potter and the Order of the Pheonix trailer
Percy Weasley's standing with the Ministry of Magic is sudden and unexplained, and there is no mention of him disowning his family when he chose to support the Ministry, which makes it difficult for those who did not read the book to understand.
Tonks' status as a Metamorphmagus is never even discussed in the film. She starts changing her nose at the dinner table without any explanation of her powers.
The Quidditch season is removed entirely from the film, as well as Ron joining the team as Keeper, Umbridge removing Harry, Fred, and George from the team, and Ginny joining the team to replace Harry. However, Ron will join the team in the movie of Harry Potter and the Half-Blood Prince.
Nearly Headless Nick is omitted and the important part where he explained to Harry that not all wizards can comeback as a ghost.[2]
Harry receiving a two-way mirror as a present from his godfather Sirius Black shortly before his death that would had allowed him to communicate with Sirius if he had not died was omitted. This may cause a continuity error for the upcoming film adaptation of the seventh book, in which this mirror plays a significant role. [2]
Differences Between Film and Novel
When Harry, Ron and Hermione first see a Thestral, Neville is with them. Neville shows no sign of being able to see the Thestral even though he can see Thestrals in the books.
In the film, the Advance Guard arrives to remove Harry from Little Whinging right after the Dementor attack. In the book, Harry is grounded for days until the Advance Guard comes.
In the film, when Harry and the Advance Guard fly by brooms, they fly up the Thames; in the book, they fly at much higher altitude to avoid detection by Muggles.
In the film, Hermione has heard of the Room of Requirement, whereas in the book she has not.
In the film, Argus Filch is aware of the secret meetings in the Room of Requirement. In the novel, he has no clue.
In the novel, Dumbledore's Army is discovered because Marietta Edgecombe, a member and a friend of Cho Chang, tattled to Umbridge. In the film, Cho is duped into revealing the truth via Veritaserum, and Umbridge and the Inquisitorial Squad break into the Room of Requirement using "Bombarda Maxima." Also, in the film, this is used as a reason for her and Harry's break-up.
In the novels, Harry finds out about the condition of Neville's parents from Albus Dumbledore significantly before Neville's other friends learn of it. In the film, Neville tells Harry in the Room of Requirement.
When Cornelius Fudge arrives to arrest Dumbledore in the film, Fawkes attacks and knocks the Ministry officials, Harry and Cho down with some sort of fire. In the novel, Dumbledore knocks out Fudge, Umbridge, Dawlish, Marietta Edgecombe, and Kingsley Shacklebolt.
In the book, after Dumbledore escapes, Phineas Nigellus Black states, "You know, Minister, I disagree with Dumbledore on several points, but you can't deny, he's got style". In the film, Kingsley Shacklebolt says a similar line: "You may not like him Minister, but you have to admit Dumbledore's got style".
Kreacher's role is diminished to only two scenes and it is never explained that he gave information to Narcissa Malfoy.
In the film, Bellatrix Lestrange kills Sirius Black with the Killing Curse, which then causes Sirius' body to fade away into the veil. In the book, the curse is not named and is not even implied to have been the Killing Curse.
In the film, Sirius mistakenly calls Harry by the name of "James". This does not happen in the book; it is only debated that Sirius views Harry as a pal in the same way he viewed James Potter.
In the film, Sirius punches Lucius Malfoy in the face, which never happened in the book.
In the book, Dumbledore uses the Fountain of Magical Brethren to protect Harry while dueling Voldemort, and Fawkes takes a Killing Curse for him. In the movie, only Dumbledore protects Harry.
As in the previous two movies, Ginny's role is diminished, and nothing of her relationship with Michael Corner is ever talked about though they are seen together at the meeting in the Hog's Head where Harry, Ron and Hermione form Dumbledore's Army.
In the film, Harry never learns that it is Sybill Trelawney who made the prophecy, in fact the scene where Dumbledore shows Harry his memory of being told the prophecy in the Pensieve is omitted. Whereas in the film, Harry hears the prophecy come out of its orb as soon as he touches it in the Hall of Prophecy.
In the novel, Ron, Hermione, Luna, Neville and Ginny fight and flee from the Death Eaters during the battle, instead of being captured by them, as they are in the movie.
In the film, Harry uses the Protego spell instead of looking into Snape's Pensieve.
Remus Lupin, Dedalus Diggle, Sturgis Podmore, and Hestia Jones are ommitted from the Advance Guard, reducing it to Alastor Moody, Kingsley Shacklebolt, Nymphadora Tonks, Elphias Doge, and Emmeline Vance. Lupin does appear later in the film, and Diggle and Podmore may appear in the photo of the original Order.
In the book, Harry meets Luna Lovegood on the Hogwarts Express, but in the movie they meet her on a carriage.
Nymphadora Tonks changes her violet hair into bubblegum pink in the start of the book, but in the movie she keeps her hair violet throughout, only changing it red once when Moody called her Nymphadora. However, she has bubblegum pink hair in some merchandising and promotional photos.
In the book Harry and Hermione were introduced to Grawp by Hagrid while the school was distracted by the Quidditch final of Gryffindor vs. Ravenclaw, while in the film Ron was also present, because there was no Quidditch in the film.
Fred and George Weasleys' departure from Hogwarts is done differently from the book. In the book they first send out their enchanted fireworks to cause a disturbance and later caused another disturbance to give Harry time to sneak into Umbridge's office to use her Floo Network and then flee after being cornered by Umbridge. In the film the Weasley twins leave after releasing their fireworks.
As the Weasley twins' diversion is cut from the film, another scene is also cut, where Harry uses Umbridge's Floo Network connection to contact Sirius and Lupin at Grimmauld Place to consult them about their treatment of Snape when they were all students at Hogwarts.
In the book, several weeks elapse between the Weasley twins leaving, and the O.W.L. Exams where Harry sees the vision of Sirius being tortured at the Ministry of Magic during the exams. In the film, these occur one after the other, on the same day, along with Harry, Ron and Hermione getting caught by Umbridge trying to use her Floo Network connection.
In the book, the Death Eaters do not Apparate inside the Ministry of Magic as they do in the movie. Apparation in the movie seems to turn the Death Eaters into a fast moving smoke rather then real teleportation, while Order members turn into a stream of light instead. Fred and George seem to Apparate the same way as in the book.
In the novel, Sirius tells Harry his family's backstory and him being disowned shortly after Harry arrived at Grimmauld Place. In the film, he tells him this during Christmas, where Harry's Christmas party with the Weasleys took place at Grimmauld Place instead of St. Mungo's.
In the book, after the kiss between Cho and Harry, Hermione gives a much longer list of reasons why Cho was crying, including her being worried about getting kicked off the Ravenclaw Quidditch team. In the movie, the list is shorter, but Hermione says that Cho is worried about failing her O.W.L.s, but Cho in the books is stated as a year ahead of Harry, so she should have taken her O.W.L.s already
In the book, Mad-Eye Moody shows Harry a picture of the original Order of the Phoenix, but in the film Sirius shows him the picture.
Harry was seen casting a nonverbal spell. However, in the sixth book Harry was said to have difficulty with nonverbal spells.
In the book, after being caught by Umbridge during his attempt to break into her office she revealed to Harry and his friends that she had sent the Dementors to Harry discreetly without Fudges knowledge as a way to discredit Harry. In the film, the one responsible is a mystery though during the Wizengamot scene Dumbledore speculated it could have been Voldemort.
During the D.A. meetings, members used Levicorpus fully although it was only introduced in Harry Potter and the Half-Blood Prince. Levicorpus is not even mentioned in Harry Potter and the Order of Phoenix
Box office performance
thumb|300px|right|David Yates - The New Director for Harry Potter films
The film took in over $292 million in box office gross in the USA-Canada market and $938 million worldwide. Among the Harry Potter films released so far, it has done second best, slightly ahead of Harry Potter and the Goblet of Fire in the North American market (where it ranks 28th all-time), but far ahead of Goblet worldwide to take 6th place all-time. The five Potter films together have now grossed more than any other series of films in history.[3]
Behind the scenes
The company which created the film trailer entitled Divine Crusade is X-Ray Dog.
In Snape's memory, Hogwarts students are seen wearing uniforms of the same design as the uniforms used in the first two movies.
