Ending credits scroll rather than pop-up like in beginning credits. In later shows, they pop-up in the ending credits too like the beginning credits.
Rita Walter usually appears only as the back of Patty or Cathy when both cousins are in a shot or as a blurred figure in a backdrop from a distance. In the barbecue scene, however, she appears as Cathy in a fairly close up shot and in focus in profile while she stands next to Ross.