The film renders a much more detailed view of a near-term future world than that present in the original book, like the film also omits certain story details for example, no punch cards. And on the other side the whole book is about 90 pages long, which is not considered a very professional length for a book. Whereas in the movie, the main characters are described and well detailed, for example its starts with John Anderton (Tom Cruise) head of an elite division of law enforcement known as "Precrime", using the visions of three clairvoyants called "Pre-Cogs," the Precrime unit is able to determine the exact date and time in the future that a murder will take place, as well as the names of the perpetrator and victim. While in the original story there's no such plot like that and it just talks about the precrime system and a bit about "pre-Cogs", and Anderton.
When compared to the original book, the film's plot is much better. The movie plot begins in 2054 and the murder rate in Washington, D.C. has been reduced to zero. The reason is the establishment of the Department of Precrime, which analyzes the visions of three precognizant humans to stop murders before they happen. The Precogs (the trade term for the three psychics) can predict a murder to the second it will occur. The system is so effective that there has not been a murder in six years because of the work of people like department of Chief John Anderton (Tom Cruise). The federal government is preparing to bring the experiment to the national level, but before undertaking such an effort, the bureaucrats need to make sure