It is stated that Mary Kane's husband is scheduled to be executed in Florida on Saturday. However, to avoid offending religious sensibilities, American prisons do not carry out executions on Fridays, Saturdays or Sundays.
Throughout the episode allusions are made to Mary Kane's husband's scheduled execution by electric chair in Florida and the possibility that if she is extradited to the United States that the same fate will befall her. While in Florida the condemned may choose death by electrocution, the more common method of execution is lethal injection. The last time someone was executed by the electric chair in Florida was in 1999. Every execution since then has been lethal injection.
Even though Harry and Tom are both going to the same floor of Thames House they press 2 different lift buttons, furthermore, whichever one is pressed, only one will light up.
Mary Kane: If you want something done, don't ask a Brit, that's for sure.
Tom: We get to her first, she stays in the country and we just might have a chance of finding out where those other bombs are. If the Amer sorry, when the Americans get their way, she's off. And god knows what happens then. Danny: Bloody Yanks, everything's a sodding competition.
Christine Dale: Get me the extradition signature, Tom, or we're both gonna look like assholes. This is non-negotiable. Tom: Meaning? Christine Dale: You know the score these days, we're waging a war. No stone unturned – no excuses, no delays. America wants Mary back, and America's gonna get her; we want our Kodak moment. Tom: I thought we were equal partners. Christine Dale: Oh, we are, which means you don't get to, uh, stand around and mean well, Tom. You actually have to get off your butt sometimes, and… do exactly what we tell ya.
Tom Quinn: I believe killing people in the cause of life is just about the stupidest thing I've ever come across.
Ellie Simm: What's that? Tom Quinn: You knew what it was last night.
The show's theme song is "Spooks", written by Jennie Muskett and published by BBC Music/Bucks Music Ltd.
The BBC and the production team wanted to keep as much mystery as possible due to the nature of the series. Being a show about spies, they decided not to have any episode title. However, they often had working titles or alternative titles. When the show was aired in the US, the American channel decided to use real titles for the episodes. They will be put as notes through out the guide. The American title for this episode is Thou Shalt Not Kill.
The air vent on the roof of Thames house was nicknamed the prawn by the production team because of the way it was curled over. It may well have been for this reason that the fake working title of spooks was, "Prawn". It is said that even now many of the files relating to [ spooks ] are still labeled, "prawn".
There was a deleted scene that did not even make it to the DVD release in which Mary Kane tells her friend's children they can only play on the Playstation if they play driving games. It seems she doesn't encourage children to take up the family tradition (terrorism) until they're a little older.
Mary Kane: Before I formed thee in the belly I knew thee. This is a reference to Jeremiah 1:5, a modified verse used by most pro-life groups to justify their extreme actions. The complete verse reads: "Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations."
Mary Kane [of Tom]: Judas. This is undoubtedly a reference to the disciple who betrayed Jesus in the Bible.
Character's Name: Mary Kane According to the Bible, Genesis 4:8, Cain is the name of the first murderer.
US Episode Title: Thou Shalt Not Kill One of the Ten Commandments, found in Exodus 20:3-17 and Deuteronomy 5:7-21. There are many references to the Bible in this episode, so it is fitting that the US title should be a quote from it.
Zoe's surveillance team is named after the British rock and roll band The Beatles.
Danny: Guy Ritchie and Madonna. Danny highlights the relationship between director (Ritchie) and Pop superstar (Madonna) as a successful Anglo-American Alliance.
Zoe: "Moscow Muels George, Moscow Muels"
The team check their radios by testing each others' knowledge of famous spy authour John Le Carre. Tom asks Zoe what George Smiley's favourite cocktail was.
Ellie Simm: No Bennie Hill, that. Ellie compares Tom to the smutty comedian Benny Hill (1924-92)
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