Banana in the Tailpipe: Phryne sabotages Jack's car by stuffing her stocking into the exhaust pipe. Of course, finding a silk stocking stuffed in his exhaust tells him who was responsible immediately.
Call-Back: the first episode to feature The Adventuress's Club. Phryne is, of course, a founding member. They'll become quite important in the spinoff, Miss Fisher's MODern Murder Mysteries.
Heroic BSoD: Jack undergoes one when he believes that Phryne has died in a car crash. When Phryne confronts him about why he's being so distant, he tells her that he found the thought of losing her "unbearable".
I Want Grandkids: The lynchpin of the murder; Gertie's father threatened to cut her off if she continued to stay single, so she planned to reveal Millie as her own to keep his money. Ailsa killed Gertie because she couldn't let her daughter in all but blood become a bargaining chip.
My Secret Pregnancy: Gertie became pregnant out of wedlock and took a six-month break from racing before giving her child up for adoption.
Oblivious Adoption: Millie is Gertie's child who was raised from birth by Ailsa.
