In the final scene, Inspector Jack Robinson says he sold his coin collection at age 12 to buy his first bicycle and tells Phryne "I rode further than I'd ever ridden before; through the uncharted wilds of North Richmond." Afterward, Phryne proposes a toast "to pirates, adventurers, and boys on bicycles.". In real life, Nathan Page who plays the inspector, started cycling at age 14 and quickly moved up the rankings of the competitive cycling world, becoming an elite cyclist and receiving multiple scholarships to train in Europe during his remaining years as a teen. Therefore the Inspector's story has at least a hint of similarity with his real life and Phryne's toast to 'boys on bicycles' might be a wink to Nathan Page's real-life experiences.
The book Jane reads in the car is "A Little Bush Maid" by Mary Grant Bruce, first published in 1910.