The film version is different to e book balcony scene because they added in the pool that wasnt really there in the book and the balcony was only used for about 20 seconds but most of the things happened in the pool.

The characters are presented on same level but when romeo was climbing to the balcony the nurse appeared instead of Juliet. And Juliet ended up appearing next to romeo and then the scene playes out with the nurse on the balcony.