AHowever the plot was heavily changed: (1) Changed from fantasy to slight science fiction, (2) They never actually try to stop the food weather, (3) The weather was isolated to the island without any part of the world knowing about it; in the movie, it becomes a tourist attraction and the food even spreads around the world, (4) Flint Lockwood, the girl meterologist, the corrupt mayor, and most of the other characters in the movie don't exist in the book, (5) The island had no association with sardines; it always rained food at the island, (6) There was no mount leftovers, (7) They never ever come back to the island, (8) The kids don't get excited with the no school, and (9) The book plot had nothing to do with many themes in the movie i.e. fame, family, individuality.
AThe town is fed up with eating sardines all the time so Flint Lockwood invents a machine that turns water into food and rains it down on the world three times a day. Unfortunately, Flint's machine has a mind of its own, and Flint must stop it before it destroys the world.