I see a lot of plane changes, i.e. the probe's orbital plane is rotated very often with respect to its previous revolution. I always thought that these maneuvers are very expensive (need to spend quite a lot of fuel): you need to fire around the point where you want the old and new orbits to "touch", the plane change axis, and from what I remember from the days when I was playing KSP that these involve quite a lot of delta-v.
So how are the Cassini people able to pull that off? Either they do have more than enough fuel left to spend it that way, or there must be a way reduce the cost of these maneuvers that I'm not aware of yet.
Is there a way to reduce the amount of fuel spent to rotate the orbital plane to such extreme degrees?