When Castle and Beckett are going into the dungeon to interview Mistress Venom, Castle says, "My safe word is 'apples'". In Season 1 Episode 1 "Flowers For Your Grave", when Castle is being arrested he uses the same line "Ooh! Bondage. My safe word is "apples".
Detective Ryan's girlfriend Jenny is played by Juliana Dever, Seamus Dever wife in real life.
Castle: C'mon! Haven't you ever wanted to do something with your handcuffs other than arrest criminals?
Beckett: No. But there is one hot, wild, kinky thing that I do like doing...(Castle looses his grip on the table he's leaning into) Putting killers behind bars!
Castle: Is that honey?
Lanie: For the smell of it I would say is caramel sauce, but I'd be testing not tasting.
Castle: Maybe our killer has a sweet tooth.
Beckett: Given the state of undress I would say it's more likely a sexual fetish.
Lanie: I can do the chocolate. I will even do the whipped cream bikini, but caramel? I prefer slippery to sticky.
Castle: (To Ryan) Does she know we can hear her?
International Episode Titles:
Czech Republic: Domina vždy plácne dvakrát (Dominatrix Always Slaps Twice)
"Patterns" by Band of Skulls
"Standalone" by Ghost In The Machine
"Save Me" by Carnaby
"Super Conductor" by Beautiful Small Machines
"Asphyxia" by Noirhaus
"Red Lips & Fingertips" by The Come Ons
"Picture Perfect" by Lindsey Ray
Original International Air Dates:
Canada: March 8, 2010 on 'A'
Australia: April 11, 2010 on Channel 7
Slovakia: December 7, 2010 on JOJ
United Kingdom: January 19, 2011 on Alibi
Germany: January 28, 2011 on Kabel Eins
Finland: February 6, 2011 on Nelonen
The Netherlands: February 10, 2011 on SBS 6
Czech Republic: March 16, 2011 on Prima
This episode's title is a play on The Postman Always Rings Twice, a classic 1934 crime novel which was later adapted into several movies and other stage performances.
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