After dinner, Robin fills Jo's glass with wine, then starts to fill Chrissy's. As the camera cuts to Robin and Chrissy, he is still filling Jo's glass.
Chrissy mentioned that she "spent the night in outpatients" in reference to a friend's injury. Outpatients departments in British hospitals are where patients attend appointments for treatment without being admitted overnight into hospital. Injuries such as the one Chrissy mentions would be dealt with by the hospital's Casualty department.