Castle: One small murder for man, one giant mystery for mankind.
Castle is mimicking the words of Astronaut Neil Armstrong just before he became the first man to step on the moon's surface on July 21, 1969. Armstrong's words were, "That's one small step for man, one giant leap for mankind."
Goof : From previous episodes, the elevator indicates that the Homicide Division is located on the fourth floor of the 12th Precinct. At the end of the episode when Castle and Beckett walk toward the stairs, there are stairs leading up but none going down. As an aside, fire codes don't allow for the open type stairs shown between floors.
The mug shot of Louie "The Lip" Maneri is a photo of Nathan Fillion in disguise.
The bank, Suisse Federal Bank, used by Peter Cordero to transfer the $25 million does not exist.
When Beckett types in the Suisse Federal Bank account number and the password, the password is visible. Nominally, a password appears as stars.
Goof: At the school dance and in Principal Dunnan's office, Kris is wearing the sash over her gown upside down.
Goof: At the beginning of the episode when Castle reads the newspaper article, you can see that in the second column, third line it starts to repeat itself from the beginning.
Goof: Esposito identifies the suspect as Jimmy Wolfinsky, although the suspect's photo has that name, the tab on the file he holds says "Jerry Wolfinsky".
Castle's cell phone ring for Martha is Toccata and Fugue in 'D' Minor, attributed to Johann Sebastian Bach.
This episode marks the first time Kate Beckett's full name, Katherine Houghton Beckett, is used.
When the tech is demonstrating the techniques used to narrow down the network connections, all of the IP addresses listed include octets greater than 255 (some higher than 300 as well). This is not possible, as no IP address can have a value greater than 255 in any of its octets.
While discussing missing drones with Castle and Beckett at the precinct, Agent Stack receives a phone call, but when he answers his phone you can see he is really not on a call. The screen is actually the home screen on an iPhone.
During the episode, Kate and Rick take a quick trip to Fort Drum to ask the Army some questions about the drone. It's a 5.5 hour drive from New York City (11 hour round trip) but they seem to make it in under an hour.
The address label seen on the package containing the Casino Royale book sent by Jackson Hunt reads "Richard Castle, 595 Broome Street, New York, NY 10013, USA" .
Goof: Castle spends quite a lot of time trying to figure out the passcode for the iPhone Beckett stole from the parked car, so that they can call for backup. Since Castle has an iPhone, he should know that one does not need to unlock the phone to call 911. All cell phones in the United States must have the ability to call 911, whether locked, unlocked or even if a sim card is not installed.
Goof: When Ryan goes to Beckett's apartment, he shows her an old picture of Smith, which is a copy of the photo that was missing from Capt Montgomery's wedding album, in which Smith is standing in the left of the photo with his right hand facing the camera, holding a wine glass. After Ryan leaves, Beckett and Castle discuss who Smith could be with Castle brandishing a different picture of Smith. This photos shows Smith standing nearer the right of the photo with his left hand facing the camera, now holding a champagne glass, and wearing the watch that ultimately identifies him (". .. a Nautilus 3800", Castle says, "... when it came out in 1981.") clearly visible. Also, previous shots of the wedding album in other episodes, and this as well, depict all the photos in landscape format, whereas the pictures of Smith seen here are in portrait format.
Goof: When Martha enters Castle's bedroom, Beckett is hiding in the closet with with a pillow clutched in front of her. The previous scene showed the other pillows on the bed. When Martha leaves the room, Castle ducks as a thrown pillow flies by. It's not shown who throws the pillow but it's implied that Beckett threw it. The problem is with the scene that follows where you can see that Beckett in the closet is still clutching the pillow in front of her.
The quote on Johanna Beckett's grave reads "vincit omnia veritas" in Latin, which roughly translates to "truth conquers all things".
Goof: When Beckett attends the formal party at the British Consulate she is wearing a strapless black gown. Were she to wear such a dress her bullet scar would be plainly visible, yet her skin remains unmarked with no sign of her scar.