The differences between the book and the movie

There many differences between the movie and the book of The Most Dangerous Game. One of the examples is that they start from different scenes. The book started when the captain told Rainsford that it is the ship-trap island, but the movie starts with a lot of friends and sailers chatting. The whole boat exploded and everyone fell out, instead of just Rainsford falling down. And also when Rainsford arrived at General Zaroff's house, there weren't any other poeple, while in the movie there were two people.