Harry Potter and the Philosopher's Stone

The novel opens on Privet Drive through Vernon Dursley's irritated eyes, as he notices owls and cloaked strangers he would rather not see. That wry, grown-up comedy runs under the whole book, and the film leaves it out. The page also holds material the screen dropped. Peeves causes chaos in the corridors. Draco and Harry first meet in a robe shop. Harry and Hermione carry a dragon up a tower at night, and Neville gets pulled into the forest detention. The climax contains one more trial, a potion riddle solved by logic rather than magic. It gives Hermione her finest moment and makes the final descent feel earned. Smaller touches land harder in prose too. In the Mirror of Erised, Harry sees not just his parents but a whole family he never knew, which makes the scene quietly devastating. Because it is the first book of seven, reading it also means meeting names and details that pay off much later.

Chris Columbus kept checking details with Rowling, and it shows: the film follows the book closely and ends the same way. The changes are mostly trims made to fit a long story into 152 minutes. The opening chapter, told from Vernon and Petunia Dursley's point of view, is gone, and the film gets to magic sooner. It adds a moment of Harry drawing himself a birthday cake in the dust at midnight. It also skips the weeks he spends back with the Dursleys after Diagon Alley, with Hagrid taking him straight to King's Cross. Minor figures such as Piers Polkiss and Mrs Figg are dropped. So is Peeves the poltergeist, even though Rik Mayall was cast and filmed scenes that were never released. Several Hogwarts episodes are simplified. Harry's first meeting with Draco in Madam Malkin's robe shop and the midnight duel are both cut. On screen, Dumbledore arranges for Norbert to be taken away. In the book, Harry and Hermione haul the dragon up the tower themselves. The detention also plays out differently. In the film, Malfoy catches all three friends at Hagrid's hut. In the book, Filch catches Harry and Hermione leaving the Astronomy Tower, and Neville ends up in the Forbidden Forest with them. In the climax, the film leaves out Snape's potion logic puzzle and goes straight from the giant chess game to the final chamber. The Mirror of Erised shows Harry only his parents, not the whole extended family that crowds behind him in the book. Steve Kloves also added lines with Rowling's approval, including McGonagall's pocket-watch joke and Ron's quip about Hermione's priorities. These give McGonagall a sassier, less anxious edge than she has on the page.