The woman who flirts with Toby at his gym has the screen name Lady Kryptonite. Her real name is revealed to be Kara. The superhero Supergirl who is from Krypton is also named Kara.
While Kevin and Lizzy are talking at the coffee shop, Lizzy states she's "still a Chicago girl." Sophia Bush (Lizzy) was a cop, Erin Lindsay, the NBC television series, Chicago P.D. (2014).