Friends
From Tardis Wiki, the free Doctor Who reference
Friends was a television show in the 2000s. Emma Webster watched Friends in her flat. (PROSE: Almost Perfect)
Behind the scenes
Jennifer Saunders and June Whitfield both made guest appearances in the two-part episode The One with Ross's Wedding, with the former also returning in the following episode The One After Ross Says Rachel.
Scott Adsit appeared in the season 7 episode The One with Ross and Monica's Cousin.