Wikipedia:WikiProject Novels/Harry Potter task force/Notability/Differences/OoP

Differences from the book
At 766 pages in the British edition and 870 in the American edition, Order of the Phoenix is the longest Potter book in the series. Screenwriter Michael Goldenberg described his task to cut down the novel as searching for "the best equivalent way to tell the story. My job was to stay true to the spirit of the book, rather than to the letter". Goldenberg said that Rowling told him, the producers, and Yates that "she just wanted to see a great movie, and gave [them] permission to take whatever liberties [they] felt [they] needed to take to translate the book into a movie she would love". Cutting down the book to meet the time frame of the film, Goldenberg explained, became "clearer when [he] figured out that the organizing principle of the screenplay was to narrate Harry's emotional journey". He and Yates "looked for every opportunity to get everything [they] could in there. And where [they] couldn't, to sort of pay homage to it, to have it somewhere in the background or to feel like it could be taking place off-screen."

One cut Goldenberg had to make, which he "hated" to do, was the absence of Quidditch, the wizarding sport. "The truth is that any movie made of this book, whoever made it, that had included the Quidditch subplot would have been a lesser film," he said. In the book, Ron grows as a character by trying out for the Quidditch team. "Ron facing challenges and coming into his own in the same way that Harry is, we tried to get that into the film in other ways, as much as possible. So, you feel like, if not the details of that story, at least the spirit of it is present in the film."

In a significant scene in the book, Harry sees a memory of his own father humiliating Snape in their school days, and Snape insulting his mother after she stood up for him. In the film, it is abbreviated to an "idea", in Goldenberg's words. "It's an iconic moment when you realize your parents are normal, flawed human beings. … Things get trimmed out, but I kept the meat of that in there — and that was what really gave me the coming-of-age story." Young Lily Potter did not appear at all, despite reports that unknown teenager Susie Shinner was cast in the role.

The scene at St Mungo's, the hospital where Harry runs into classmate Neville Longbottom and learns that his parents were tortured into insanity by Bellatrix Lestrange, was cut because it required the construction of a new set. The main purpose of the action of the scene was relocated to the Room of Requirement after one of the D.A. lessons.

The character of Kreacher the house-elf, who was included in the script only at Rowling's request, has a larger part in the book than the film. In the novel, he is seen saving some of the Black family's artefacts which the Order of the Phoenix throw away, one of which is a locket which becomes of great importance in the seventh book. "It was kind of tricky to raise that in our story, because it's for so much later," Yates said. "We figured we can probably introduce it later, and that's the approach we took".

Rita Skeeter, the journalist played by Miranda Richardson in Goblet of Fire, was cut in the adaptation from book to film. Richardson noted that "it's never gonna be the book on film, exactly. … They'll take certain aspects from the book and make it something that they hope is going to be commercial and that people want to see."