History AdaptationExpansion / LiveActionFilms

*** Before the big climatic battle, Professor Snape summons all the students into the Great Hall, and asks them to help him find Harry. Harry dramatically reveals himself, and a fight breaks out leading to Snake fleeing to Voldemort. The scent in the book is much simpler. Snape asks a couple teachers to help him locate Harry, they refuse, and he flees. Harry spends the whole scene hidden under his Invisibility Cloak.

* In ''Film/Casper'', apart from the characters of Casper and the Ghostly Trio, the story is original. The ghosts themselves are tweaked, with Casper becoming a 12-year-old instead of a younger child and the Trio [[RelatedInTheAdaptation stated to be his uncles]] instead of just three older ghosts he lived with.

** ''Film/PrinceCaspian'' has even more expansion. Miraz gets developed into a Borgia/Medici style tyrant. It also adds the rivalry between Peter and Caspian, and Caspian getting PromotedToLoveInterest for Susan (with Caspian being {{Age Lift}}ed to make this happen -- in the book he's only 13 and he and Susan barely even have a scene together). There's also a 15-minute StormingTheCastle sequence, inspired by a passing suggestion made in the book that was never taken up, and a summoning spell that got interrupted in the book goes further in the movie, bringing back the White Witch for one scene.

** ''Film/PrinceCaspian'' has even more expansion. Miraz gets developed into a Borgia/Medici style tyrant. It also adds the rivalry between Peter and Caspian, and Caspian getting PromotedToLoveInterest for Susan (with Caspian being {{Age Lift}}ed to make this happen -- in the book he's only 13 and he and Susan barely even have a scene together). There's also a 15-minute StormingTheCastle sequence, inspired by a passing suggestion made in the book that was never taken up. A summoning spell that got interrupted in the book also goes further in the movie, bringing back the White Witch for one scene.

** Blue Sky's computer-animated ''[[WesternAnimation/HortonHearsAWho2008 Horton Hears a Who!]]'', on the other hand, actually doesn't stray too far from the limited source material, although there are still tons of added elements, notably an anime-styled scene in the middle and a sudden CrowdSong at the end.

** ''Film/PrinceCaspian'' has even more expansion. Miraz gets developed into a Borgia/Medici style tyrant. It also adds the rivalry between Peter and Caspian, and Caspian getting PromotedToLoveInterest for Susan. And a summoning spell that got interrupted in the book goes further in the movie, bringing back the White Witch for one scene.

** ''Film/TheLionTheWitchAndTheWardrobe'', partially because the filmmakers had the benefit of having the entire series to draw on, with lots of {{Call Back}}s/[[CallForward Forwards]] to events from later entries which hadn't yet been planned when Lewis wrote the novel, and also because the novel is quite thin-on-the-ground with its descriptions and exploration of the world. We get to explore the backstory of the Pevensies, and a battle that lasted a couple of pages in the book gets a proper [[BigBadassBattleSequence Hollywood treatment]] in the film.

** The fourth, ''Casper and Emma Go On Safari'' is loosely based on one of the spin-off books, which featured the titular kids' plush toys as the main protagonists, and made needing to find a lion cub back to his mommy to an English-speaking ([[JustifiedTrope it was filmed in South Africa]]) [[SpoiledBrat Spoiled Brat]] who wants a stolen lion cub as one of her '''many''' toys.

** ''Film/TheLionTheWitchAndTheWardrobe'', partially because the filmmakers had the benefit of having the entire series to draw on, with lots of {{Call Back}}s/[[CallForward Forwards]] to events from later entries which hadn't yet been planned when Lewis wrote the novel, and also because the novel is quite thin-on-the-ground with its descriptions and exploration of the world. We get to explore the backstory of the Pevensies, and the climactic battle that took a couple of pages in the book is greatly expanded with its events shown in realtime rather than flashback.
** ''Film/PrinceCaspian'' has even more expansion than ''The Lion, the Witch, and the Wardrobe''. Miraz gets developed into a Borgia/Medici style tyrant. It also adds the rivalry between Peter and Caspian, and Caspian getting PromotedToLoveInterest for Susan. And a summoning spell that got interrupted in the book goes further in the movie, bringing back the White Witch for one scene.

** ''Film/TheLionTheWitchAndTheWardrobe'' has some Adaptation Expansion. We get to explore the backstory of the Pevensies, and a battle that took a couple of pages in the book is the main course of the film.

** The film touches on Sonic's backstory, something that is unexplored in [[VideoGame/SonicTheHedgehog the games]] and which Creator/{{Sega}} usually forbids in licensed material (such as [[ComicBook/SonicTheHedgehogArchieComics the post-reboot Archie comics]], [[ComicBook/SonicTheHedgehogIDW the IDW comics]], and [[VideoGame/SonicBoom the game that became "The Rise of Lyric"]]) as one of their mandates. He was raised as a child by a motherly owl named Longclaw, [[spoiler:who sacrificed herself to protect him from a hostile tribe of echidnas who wanted to harness his powers for likely evil purposes]].
** To a greater extent, the entire film shows Dr. Robotnik's slow transformation into his video game persona, evolving from a dapper scientist enlisted by the government to the crazy, dishevelled madman that we all know and love. In the games, his background is completely unknown beyond his grandfather inspiring him to become a scientist, but in the movie he is an orphan.

** The fourth, ''Casper and Emma Go On A Safari'' is loosely based on one of the spin-off books, which featured the titular kids' plush toys as the main protagonists, and made needing to find a lion cub back to his mommy to an English-speaking ([[JustifiedTrope it was filmed in South Africa]]) [[SpoiledBrat Spoiled Brat]] who wants a stolen lion cub as one of her '''many''' toys.

** The sixth movie and on, however, does completely its own plots, but with the same primary characters.

** The fourth, ''Casper and Emma Go On A Safari'' is loosely based on one of the spin-off books, which featured the titular kids' plush toys as the main protagonists, and made needing to find a lion cub back to his mommy to an English-speaking ([[JustifiedTrope it was filmed in South Africa]]) Spoiled Brat who wants a stolen lion cub as one of her '''many''' toys.

** ''Film/TotalRecall1990'', which was an adaptation of Philip K. Dick's short story "We Can Remember It for You Wholesale". [[spoiler: The original story ended shortly after the hero returned to his apartment after visiting Recall, the film keeps going in a different direction from there on.]]

* ''Film/{{Paddington}}'':

* ''Literature/IWantToEatYourPancreas'': The live action film includes a segment from whole cloth set 12 years later showing Sakura's continued influence on the lives of those around her [[spoiler:so long after her death.]

* ''Film/JurassicPark'' was pretty faithful to [[Literature/JurassicPark the novel]] for a big-budget Hollywood adaptation. ''Film/TheLostWorldJurassicPark'' didn't fare nearly as well, but at least had one or two scenes from the book. ''Film/JurassicParkIII'', on the other hand, was made up almost entirely out of whole cloth, other than a scene in a pterodactyl aviary. The subsequent ''Film/JurassicWorld'' films are an original continuation of the story with an almost entirely new cast of characters, both human and dinosaur.

** Contrary to what WordOfDante might tell you, ''Ride/TheHauntedMansion'' has no real backstory. [[Film/TheHauntedMansion The 2003 movie]] responded by [[AscendedFanon ascending some fanon]] and bringing in a few {{Canon Foreigner}}s.