Susan's best friend who dies (Linda) has never been mentioned before this episode.
First appearance of Kris Marshall as Nick since S04 E14. He would make one more appearance in the main show (The 2004 Christmas Special "Glad Tidings We Bring" - S05 E15) followed by one final appearance as Nick Harper in the March 11th 2005 Comic Relief Special (listed as S05 E16).