The title is a quote from a poem by Percy Bysshe Shelley, "Love's Philosophy": The fountains mingle with the river, / And the rivers with the ocean; / The winds of heaven mix forever / With a sweet emotion; / Nothing in the world is single; / All things by a law divine / In another's being mingle-- / Why not I with thine? // See, the mountains kiss high heaven, / And the waves clasp one another; / No sister flower could be forgiven / If it disdained its brother; / And the sunlight clasps the earth, / And the moonbeams kiss the sea;-- / What are all these kissings worth, / If thou kiss not me?
Caroline O'Neill, playing Mrs Chapman, may now be more familiar to followers of Morse's Oxford in the prequel series "Endeavour," where she appears as the character Win Thursday.
The part of Quentin Jackson is listed as being played by Billy Geraghty. The role was actually played by William Hope.
By the 2020s, Neil Pearson was known as an actual antiquarian book seller, with his own shop, outside of his acting career. Considering the plots in this episode, that may not be a casting coincidence, and in certain scenes, his dialogue sounds like he is talking about his personal feelings, duplicating the character.
The church is St Mary's Church, Turville and is the church used in The Vicar Of Dibley. The house Lewis parks outside the vicarage in the series.