When Castle premiered, it was unlike any show we had ever seen. It partnered a crime writer with a NYPD cop, who ended up falling in love. Richard Castle, the author, starts off as an arrogant celebrity who ends up becoming a romantic, goofy partner for Kate Beckett.
But there are some things even the best detectives (or biggest Richard Castle fans!) wouldn't know.
1. Couples Therapy
Their on-screen chemistry was always palpable, but in real life the actors hated each other. Stana Katic announced she was leaving the show after season 8, and that's when it was revealed that she and Nathan Fillion couldn't stand each other.
“Stana Katic and Nathan Fillion completely despise each other," said a source from the set. "They will not speak when they are off set, and this has been going on for seasons now. This season, it got so out of hand they made Stana and Nathan go to couples counseling together.”
2. So Many References
Nathan Fillion, who played Castle, was also on a well-loved (but short-lived) television series called Firefly. The Joss Whedon show made many small appearances in Castle, with many of the actors taking guest roles. In one episode, Castle himself dresses up in his Firefly costume.
3. Say Again?
Stana Katic hid her (alleged) hate for Fillion pretty well, but that's not her only acting talent. Katic speaks fluent English, Italian, French and Serbian fluently. She can also break out perfect accents in English, British, South African, Greek and Spanish.
4. True Love!
Ryan and Jenny weren't just a cute couple on-screen, they were also married in real life! Seamus and Juliana Dever were married in 2006.
5. The Books Are Real
When you hear the characters talking about Nikki Heat or Derrick Storm novels, you can actually go and read them yourself! There have been seven Nikki Heat novels released, all of which placed on the New York Times Best Seller List. Additionally, there are two Derrick Storm books. Readers do not need to watch the series in order to enjoy the books, but there are a couple references to the show which viewers will get.