This is the first appearance of Ryan's girlfriend, Jenny. She is played by actor Seamus Dever's real-life wife, Julianna Dever.
Castle's line "Remember my safe word is apples" is a throwback to Flowers for Your Grave (2009) in which Castle says the same thing to Beckett after she had him cuffed.
Both Amy Guminick (Danielle) and Gil McKinney (Tyler Benton) have both appeared on the CW show Supernatural as members of the Winchester family, with Guminick as Mary Winchester and McKinney as Henry Winchester.
The mascot on Alexis' cheerleading uniform is the mascot for the University of Central Arkansas Bears.
While in the bondage store, Beckett shows her badge with the number 0334.