Óscar Faura, the second unit director of photography, had the main mission of shooting with freedom whatever he thought it was visually interesting, and not to worry about coverage, because the cinematographer Xavi Giménez was doing that. Faura carried an ear piece through which Banderas would told him to catch this and that.
The famous rain scene, so famous that gave the movie its English title, 'Summer rain', was completely improvised. When started pouring and the crew thought they would have to wait until it stopped, director Antonio Banderas decided on the spot to seize the moment and have most of the characters just jumped in the rain and start celebrating.