Continuity error: When Beckett and Castle are talking to Ryan in the coffee room, Beckett's coffee cup handle keep changing directions.
Victor Webster (Josh Davidson) is the third "Charmed" star to guest star on Castle. Alyssa Milano appeared in the season 2 episode "A Rose for Everafter" and Brian Krause appeared in the episode previous to this one, "Under the Gun".
Castle: (to Beckett) So I wear boxers, what do you wear? Thong? Cheekies? I told you mine! Bloomers? Granny-panties? Commando?!
Beckett: Your real problem is that girls who adore their daddies usually end up marrying guys just like them.
Castle: They do?
(Talking about Castle's "Smorelet")
Castle: Aha. I knew you'd reconsider. It's kind of like David Hasselhoff. First you're repulsed, but then, strangely, you're drawn in.
Alexis: No. Still repulsed.
Castle: How do you know when you're in love?
Beckett: All the songs make sense.
Lanie: Based on the amount of it (referring to rust), I'd say that bullet is 200 years old.
Castle: A 200-year-old bullet can only mean one thing. Time-traveling killer.
International Episode Titles:
Czech Republic: Subkultura (Subculture)
"Kiss Kiss Bang Bang" by Nitzer Ebb
"Me You And Watson" by Alec Ounsworth
Original International Air Dates:
Canada: October 11, 2010 on CTV
Australia: February 27, 2011 on Channel 7
Germany: March 18, 2011 on Kabel Eins
United Kingdom: March 30, 2011 on Alibi
The Netherlands: May 5, 2011 on SBS 6
Czech Republic: February 8, 2012 on Prima family
Slovakia: September 26, 2012 on JOJ
Castle: Well, do you think D'Andre the giant was telling the truth when he said he found the wallet in the grass??
André René Roussimoff was a French born pro-wrestler turned actor nicknamed Andre the Giant.
The Steam-Punk Sleeve (Arm) Castle is wearing is near identical to the sleeve worn by Steam-Punk author G.D. Falksen.
Beckett: He does kinda look like Yosemite Sam.
Yosemite Sam is an American animated cartoon character from the Looney Tunes. He is commonly depicted as an extremely grouchy gunslinging prospector or cowboy with a hair-trigger temper and an intense hatred of rabbits, particularly Bugs Bunny.
Esposito: Why did he go all Hulk Hogan on me?
Hulk Hogan is the ring name of Terry Gene Bollea. He's one of the most popular American professional wrestlers.
Ryan: Photo on the license matches Captain Underpants here.
Captain Underpants by Dav Pilkey is a series of American children's books about two fourth graders, George Beard and Harold Hutchins, and the aptly-named superhero they accidentally create by hypnotizing their principal, Mr. Benny Krupp.