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Trivia: Castle
  • Actor Allusion: Like his actor, Jon Huertas, Esposito is a military veteran.
  • Dawson Casting: Averted by Alexis Castle as Molly Quinn is nearly the same age as her character.
  • Fake American: Both lead characters are played by Canadian actors.
  • Fake Brit: "The Limey", particularly the Scotland Yard detective who consults in the case, is very clearly an Australian.
  • Hey, It's That Guy!: Overlaps frequently with Narrowed It Down To The Guy I Recognize. If you don't see a person here, chances are they're there, as one of the suspects of the week.
    • Nathan Fillion is Castle.
    • Stana Katic (Hana Gitelman, Talia al Ghul) is Beckett.
    • And Samuel Anders is a Romantic False Lead.
    • Season 2's "The Fifth Bullet" has Shawn as one of the suspects being questioned by Esposito.
    • Riley featured in a surprising twist and a relationship with Cut Throat Bitch.
    • Myka is also a writer in a Season 1 episode.
    • Kat probably doesn't remember the month when she wrote webisodes for a sci-fi series.
    • Nathan Stark apparently didn't die in Eureka; he became a sci-fi actor.
      • His ex-wife is Gates's sister.
    • Soap fans already had Joey Buchanan and Ian Devlin in the main cast; they threw in Carly/Claudia as Castle's date and even Winnifred for a scene in "The Third Man".
    • Looks like The Doctor finally settled on his name: Dr. Death!
    • Looks like Vladimir Bierko gave up on the terrorist gig and became a fashion designer, of all things.
    • Whedon fans have run into several other familiar faces: Principal Wood as a Corrupt Corporate Executive, Riley Finn as an amnesiac witness, Dominic, Forrest, and Principal Flutie as the precinct's lawyer in the second episode. We also have Adam Baldwin as Detective Slaughter.
    • Dana Delaney, who guest-stars in the two-parter "Tick...Tick...Tick...Boom!" is a multiple Emmy winner who was once a fixture on lists of the most beautiful people in Hollywood. Most tropers watching this show will probably recognize her as Lois Lane (leading to the always weird effect of Lois-sounding dialogue coming from the un-Lois-looking Delaney's mouth), or Katherine Mayfair, where Nathan Fillion played her husband.
      • Which gives a new layer of meaning to Nathan's line "Except for my second wife, this is the most sexless relationship I've been in."
      • The same two-parter has Handsome Jack as the villain.
    • One recurring HITG is Phil LaMarr.
    • Dan Castellaneta has a recurring role as a judge.
    • Erick Avari would like to warn you about Mayan Curses. A fantastic Casting Gag, especially if you recall how he kicked it in the movie.
    • Theresa from The O.C. (or Amita from NUMB3RS) has apparently got a degree in Archeology and is working with mummies.
    • "Den of Thieves" has Max Medina and Francie.
    • Michael Ironside is a suspect of the week.
    • Assistant Director Walter Skinner (or Colonel Caldwell) shows up in "A Deadly Game" as a hardened spy-stroke-assassin who ends up turning out to be some hapless schmuck on a spy vacation.
    • "A Deadly Affair" has Wendy the waitress show up as the wife of one of the murder victims.
    • "Little Girl Lost" has Carla as the mother of the lost girl.
    • "3XK" has Drew from the last series of Scrubs as a suspect's terrified ex prison roommate who is in actuality the serial killer who masterminded the episode's killing in order to escape prison, as well as Marshall Darling as the father of a serial killer's cold-case victim.
    • "Always Buy Retail" has Hardison as a Nigerian immigrant.
    • "One Life To Lose" has Henry Spencer as a soap opera actor.
    • "Under the Gun" has Leo Wyatt as a priest who was also a suspect, Raina also known as Nikki as the victim's wife and Jason as Beckett's mentor.
    • "The Mistress Always Spanks Twice" has young Mary Winchester and Allison Kerry.
    • "He's Dead, She's Dead" features Beth Mason as the daughter and Patty Chase as the widow of the victim.
    • Two Reaper alumni, Ray Wise and Rick Gonzalez, have appeared on the show as a baseball player's agent and a squatter, respectively.
    • Lance Henriksen is an abduction therapist in "Strange Encounters of the Murderous Kind"
    • "Nikki Heat" has Donna Pinciotti as the actress (in-universe) who plays Nikki Heat on screen.
    • In "Poof! You're Dead", Joanne helps with the magician's investigation. Martel is the real murderer, it turns out.
    • Dr. Goodman's five-season mystery sabbatical is finally explained—he becomes a drug lord who can very easily get under the skin of Castle and especially Beckett.
    • As of 'Set Up', Nathan Petrelli works for the actual Department of Homeland Security in this universe. Trying to prevent a nuclear bomb from going off in New York City. Sure it's not Peter?
      • And Noah Bennet is the corrupt Senator Bracken.
    • Mimi is an interior designer.
    • Lt. Ruiz is in the 12th precinct, seen in "When the Bough Breaks" and "The Double Down".
    • In "Law & Murder", one of the jurors has appeared before in the show.
    • Mac is an intern on a soap opera in "One Life to Lose".
    • Loker is an up-and-coming writer that Castle mentors in "Dead Pool".
    • Helen Santos is now married to a Donald Trumpalike?
    • Said Donald Trumpalike is David St. Hubbins.
    • Mike Franks is an antique gun nut in "Punked".
    • Steve Stevens is the presiding judge in the trial in "Law & Murder."
    • Dave Bowman appears in the pilot episode as the father of one of the victims.
    • Alexis' boyfriend is Ben from The Secret Life of the American Teenager.
    • Michael Dorn, who starred as Worf in Star Trek: The Next Generation and Deep Space Nine, is Beckett's police-mandated therapist.
    • Our new captain was Kasidy Yates.
    • Azazel appeared in Castle's supernatural-themed Halloween episode, where characters talked about ghosts and demons. Azazel himself finds the idea of demons to be ridiculous. He turned out to be the killer.
    • Lee Garner, Jr. is one of the people holding up a bank in "Cops & Robbers."
    • Pierre Chang is now leading a Chinese gang.
    • It seems Castle has become something of a Star Trek: Deep Space Nine Reunion Party, because Major Kira Nerys featured in "An Embarrassment of Bitches".
    • Also prominently featured in "An Embarrassment of Bitches"? Hilarie Burton, known to some as Peyton Sawyer and Sara Ellis.
    • Beckett's mysterious benefactor holding the attack dogs at bay seems to have stepped up from his previous miserable life.
    • Garrus is found chained up in his apartment in one episode.
    • Paul Ballard is the one who tried to kill Beckett. The Dollhouse must be involved in the conspiracy.
    • DC Douglas shows up in "Dial M for Mayor" as a lawyer.
    • Derek Hale appears in "Fool Me Once" as Alexis's new violin teacher. Teen Wolf fans are shocked to discover that he's capable of smiling.
    • Nan Flanagan is an art collector. And murdered a curator.
    • Helo is Cole maddox, in a shocking contrast to his earlier role.
    • Sarah Drew in "Nanny McDead".
    • Gretchen now works in television, and even tries to get Castle into bed with her.
    • Apparently, Phil has a habit of backstabbing main characters.
    • Todd the Wraith/Druitt/the Big Guy is a French black-ops freelancer in "Hunt".
    • Jiminy Cricket is Dr. Daryl Meeks, the Bigfoot "expert."
    • The show also has something of an all-star crew, especially if you were a sci-fi fan in The Nineties and The Noughties (which may explain some of the guest stars):
      • Rob Bowman - who directed 33 episodes of The X-Files and the first movie (The X-Files: Fight the Future) is a featured director and Executive Producer, and cut his teeth directing Star Trek: The Next Generation, which allowed him to pull in Jonathan Frakes to direct a few episodes (most notably "The Final Frontier")
      • Thomas J Wright - who directed a full third of Millenium also pops up occasionally.
      • Rene Echevarria - of Star Trek TNG & DS9 fame - wrote for the first two seasons.
      • Jose Molina (Firefly) is another recurring writer.
      • As is David Amann (The X Files).
      • Even the composer fits here: It's Robert Duncan, who worked on the later seasons of Buffy.
    • Mr. Fantastic is billionaire Eric Vaughn.
    • "A Rose for Everafter" has Phoebe Halliwell as Castle's old flame.
    • James Brolin is Castle's father.
    • Kaidan Alenko is a Bigfoot hunter.
    • The director of the Heat Wave movie is Bolin.
    • Meet Beckett's new partner: Cuddy.
    • Hicks is apparently a journalist in DC.
    • "Time Will Tell" has Joshua Gomez and Tim Russ.
    • Arrow's John Diggle (David Ramsey) plays an elementary school teacher in season 2's "Fool Me Once".
  • Hey, It's That Place!: Sort of. The warehouse that they fight the murderer in "Boom!" in returns again in "Setup," with absolutely nothing to disguise it and several shots of the warehouse which are basically exactly the same in both episodes. Either they ran out of locations or the terrorist in setup used the same warehouse again. Lampshaded by Castle when he wonders why that particular building is so popular.
    • The hallway leading to the sleazy boyfriend's apartment in "Pretty Dead" seems very familiar - especially its distinctive square window.
    • They don't even try to hide the fact that the hangar they use in "Secret Santa" is the same hangar that was used for the climax of "Knockout".
    • Castle didn't actually go very far in his pursuit to retrieve Alexis in France. They use the same church in "Hunt" as the one previously used in "Always".
  • I Want You to Meet an Old Friend of Mine: Some of the people that help Castle and the 12th also happen to be people Nathan Fillion has worked with in the past, most notably Dana Delany in "Tick Tick Tick"/"Boom!" and Kristen Lehman in "Eye of the Beholder." Castle's first wife, Meredith, is played by Darby Stanchfield, who also played his wife in Waitress. Alyssa Milano is also apparently a friend of Nathan's, but the two haven't worked together except for "A Rose for Everafter." "Headhunters" finally brought a Firefly alumnus to the table in the form of Adam Baldwin. Gina Torres gets in the game in "Reality Star-Struck". Still waiting on the others! A minor one in Reality Star Struck (aka the one with Zoe), but notable as being between two guest stars, rather than a guest star and a main cast member: Patrick Fabian plays the reality show director, and Lachlan Buchanan plays the son of one of the show's stars. They previously worked together on the CMT sitcom Working Class.
  • Real-Life Relative: Kevin Ryan's (Seamus Dever) girlfriend/fiancée/wife, Jenny O'Malley, is played, when she appears, by Dever's real-life wife Juliana.
  • Retroactive Recognition: On a big-name show with 6 seasons under its belt, probably bound to happen, too. Check under Hey, It's That Guy!, though.

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