Reflections on the movie one flew over the cuckoo's nest with respect to the book

The movie opens up with an image of a mountain; not mentioned in the book.

Next, there are several shots of the patients sleeping;also not mentioned in the book.

After, nurse Ratched walks into the hallway of the institute, where whe is greeted by evryone: the black boys, the other nurses.

Then, the patients come by to take their medication