The title, "Kinbaku," is the Japanese word for bondage.
In Ellison's office there is a framed newspaper article that mentions the destruction of Stark Tower during the battle of New York.
This is the only episode in this season where Frank Castle/The Punisher doesn't appear.
The Distillers's song "Die on a Rope" is playing in the car when Matt and Elektra first arrive at Roscoe Sweeney's house. In a later scene, the restaurant in which Matt and Karen's date takes place is the real-life setting of a solo acoustic performance by Brody Dalle, the singer of The Distillers, that was released on YouTube by N.P.R.