Say your in 3rd person and pan around you character, then click first person but want the camera to stay where you had set it rather than back in the direction the character was facing... a quick click forward of the direction stick (as cam is transitioning from 3rd to 1st) will keep the camera facing where you panned it. Not much but I just found it jarring when the camera looked to where the character faced rather than where I moved it to.