The first major similarity is the series of events that led up to the ordeal. In the book, it starts off with a meeting of the President and most of the cabinet. It is almost the same in the movie. However, the movie starts off with the U-2 plane actually taking the pictures, which is not in the book. After the U-2 flight, the movie then joined the book, where the President and the cabinet met together for the briefing. After the meeting, everyone realized that the Soviet Union was lying about the whole situation. They were in fact transporting nuclear missiles to Cuba when they promised that they were not. Another similarity that ties into the events that led to the ordeal was the meeting between John F. Kennedy and Andrei Gromyko. They talked about the same subject, the Soviets helping the Cubans. Then, President Kennedy read out a statement that pointed out several serious consequences that would arise if the Soviet Union placed missiles in Cuba. Then, Gromyko lied right to his face, and assured him that the Soviet Union would never give missiles to Cuba.
The second major similarity is the influence of