Entertainment : 5 things you didn't know about Caslte

1. Nathan Fillion (Castle) read the script with 125 actresses to find the perfect Beckett.
2. Seamus Dever's (Kevin Ryan) wife (Juliana Dever) in real life plays the role of his wife on the show too.
3. There is an actual book called 'Heat Wave' written by Richard Castle and was released as a part of promotions.
4. Unlike most TV shows, the cast hangs out even when they are not filming.
5. Many of the actors who appear on "Castle" once appeared on Joss Whedon's shows "Buffy, the Vampire Slayer" and the short-lived "Firefly".