"I'm in the Mood for Dancing" by The Nolans is this episode recurring song, both opening and ending the episode with this song.
Leftover from his takeout Chinese meal with 'Stevie,' River's fortune cookie reads: "Do not go where the paths may lead. Go where there is no path and leave a trail."
This quote is frequently attributed to Ralph Waldo Emerson, but this is false. But similar wording is seen in a poem published in August 1903 titled "Wind-Wafted Wild Flowers" by Muriel Strode as thus: "I will not follow where the path may lead, but I will go where there is no path, and I will leave a trail. Infinitely will I trust nature's instincts and promptings, but I will not call my own perversions nature."
This quote is frequently attributed to Ralph Waldo Emerson, but this is false. But similar wording is seen in a poem published in August 1903 titled "Wind-Wafted Wild Flowers" by Muriel Strode as thus: "I will not follow where the path may lead, but I will go where there is no path, and I will leave a trail. Infinitely will I trust nature's instincts and promptings, but I will not call my own perversions nature."
Mentioned during this episode, mirtazidine is a prescription medicine for treatment of depression. It might be known also under the brand name of Remeron.
In the episode, River mentions the invention of the fortune cookie. Makoto Hagiwara of Golden Gate Park's Japanese Tea Garden in San Francisco's Golden Gate Park is reported to have been the first person in the U.S. to have served the modern version of the cookie when he did so at the tea garden in the 1890s or early 1900s. The fortune cookies were made by a 1906 San Francisco bakery, Benkyodo, on Buchanan Street, but it has since closed.
Nicola Walker (Jackie 'Stevie' Stevenson), Adeel Akhtar (Ira King) and Josef Altin (Christopher Riley) also worked together in Unforgotten (2015), as DCI Cassie Stuart, Hassan Mahmoud and Tyler respectively.