(As Beckett goes to speak to the sister of the deceased, to tell her what happened)
Castle: How does she do that?
Capt. Montgomery: (seeing an alternative meaning) Better than anyone I know.
Castle: (looks over at the captain) You okay?
Capt. Montgomery: Her brother died trying to get something to me. No. I'm not okay.
(The original victim's casket has just been opened by Dr. Perlmutter)
Castle: Someone had to have paid to get rid of the body, just in case Brady every wanted to come clean with the police.
Beckett: Mmm-hmm. Looks like it.
Castle: This guy's got contingency plans for his contingency plans! It's like we're battling a supervillain!
Dr. Perlmutter: Excuse me! Dynamic duo! (Closes the casket) What am I doing with this?
Castle: Well, it depends. What can you get for a second-hand casket these days?
Beckett: I'll call Olivia's family and find out what they want to do.
Castle: Seriously, though. I wonder what you could get for a slightly used coffin. That thing is top of the line! (spinning around, realizing...) Did you check the drawer?!?
Dr. Perlmutter: What drawer?
Castle: High end coffins often have a small drawer hidden somewhere in the lid. That way one can hide his momentos in there, or psychotic killers can hide evidence...
Beckett: Are you looking at porn?
Castle: I use Ryan's computer for that.
In the opening, after the car hits the cyclist, and the driver jumps out of the car, the overhead shot shows the bicycle under the front bumper, seat near the driver's front wheel. After the driver gets back in the car and drives away, the bicycle is much further away from the car, facing a different direction, and laying on its other side.
Title: Kill The Messenger
The title phrase is a common riff off a phrase associated with Shakespeare: "Don't shoot the messenger", which occurs in both the play Henry IV, Part 2 as well as Antony and Cleopatra. The concept predates that, however, to the time when an envoy with a message might be sent to an opposing leader, who, in rage at the content of the message, might strike at the messenger standing in proxy for the author.
Dr. Perlmutter: Excuse me! Dynamic Duo! What am I doing with this?
The Dynamic Duo is a term often used to refer to the pairing of Batman and Robin, popularized during the 60s with the campy live-action Batman TV series.