Twice, Enola offers laboring boys £5 for their clothing, about £350 (US$455) in 2020. In 1880, a common laborer earned about 3 shillings 9 pence per week, or £9.15s. per year. Enola offered the laborers six months' salary for their clothes.
Millie Bobby Brown and her sister Paige Brown, fans of the books, approached author Nancy Springer with the intention to star and produce the film under their own label. Legendary Entertainment offered financing while Millie Bobby was filming Godzilla II: King of the Monsters (2019) for the company. For this film, Millie Bobby was paid $6 million for her starring role and an additional $500,000 as a producer fee.
Enola and her mother are shown keeping bees, a hobby Sherlock took up in retirement.
Based on the Nancy Springer book series "The Enola Holmes Mysteries", which follows Sherlock and Mycroft Holmes' much younger sister, Enola.
Una Stubbs: The housekeeper who tells Enola she has a visitor near the end; she also played Mrs. Hudson, the housekeeper, in Sherlock (2010).