Goof: At the end of the episode when Jack is telling Nadia about the picture of her mother, there is one shot that was reversed, so the picture is backwards.
Lena Olin was unavailable, at the time of production, when picture inserts were needed of her, for the picture found by Nadia in this episode, of Irina holding a baby [her niece]. At the last minute, Angela DeAwn [Nadia], offered to step in to play the part of Irina in the picture.
Kiera/Meghan asks Vaughn if he works for MI-5, but MI-5 is Britain's counterintelligence service, and doesn't operate outside of Britain. MI-6 is foreign intelligence.
The second picture Nadia goes through is a B&W of Jennifer Garner in glasses with her real life sister, Susannah on the right. In the middle is supposed to be Irina.
The language locals speak in the hospital in Montenegro is Russian, but the language spoken in Montenegro is Serbian.
In the Montenegran hospital all the light switches are American. Only American light switches flick up to turn on. Montenegran ones would flick down to switch on.
Weiss: Killed? He exploded like a frozen pinata.
Vaughn: There are other ways to keep him from having power over you, to make him go away.
Kiera MacLaine: You underestimate my brother.
Vaughn: Or maybe you underestimate me.
Fintan Keene: You should be nicer to your big brother.
Fintan Keene: Isn't that what the Bible says?
Vaughn: Why, do I look like some kind of expert?
Vaughn: When's the last time you went to confession, Kiera MacLaine?
Kiera MacLaine: ...I'm not sure how I'm supposed to feel.
Vaughn: About what?
Kiera MacLaine: A flirty priest.
Vaughn: I assure you my intentions are honorable... mostly.
(Sydney, Vaughn and Dixon are on a mission)
Dixon: Phoenix is in play.
Vaughn: Copy that.
Dixon: It's too risky, but I wish she was wearing a transmitter.
Vaughn: She will once they trust her, besides it'll give you a chance to brush up on some of your old school tricks.
Dixon: Hey! Have a little respect for your elders.
Sloane: He believed that Ice 5 was being covertly developed there by a man named Fintan Keene.
Dixon: Haven't heard that name in a while.
Sloane: That's because Mr. Keene claims to have gone legitimate.
Sydney: Seems to be all the rage among evil geniuses.
Vaughn: It's not everyday you see a guy shatter into a million pieces.
Jack: Is something on your mind Agent Vaughn?
Vaughn: (hesitant) No, not really. I'm not very sleeping well.
Jack: It's Lauren, isn't it.
Vaughn: I think I see her sometimes; I thought I saw her in the market in Algeria. Did that ever happen with you?
Jack: Do I have visions of Lauren?
Vaughn: I don't know that many people who killed the woman they were married to. I was just wondering if that's what happens.
Jack: It did, now it doesn't.
Jack: (to Nadia) Irina told me years ago that this is a picture of her holding her niece. She told me that holding this baby filled her with a longing and a hope to have children of her own. The next day I asked Irina to marry me; I wanted my child to be loved like the baby in this photograph. Of course, her story could have been a total fabrication, another one of her countless lies designed to draw me in. But I choose to believe it was truth. When we had Sydney, Irina held her in this exact same way, and I can only imagine that she did the same with you. So for me, I choose to believe. But than I suppose each of us needs to find out own sense of closure.
Modell: My bird is missing.
Weiss: It's "I've lost my canary."
Kiera MacLaine: Forgiveness is a tricky thing, isn't it?
Fintan Keene: My sister may look like an angel but her heart is as black as yours and mine.
Vaughn: I was married for a short time... The woman I was married to betrayed me, she betrayed a lot of people. And when I found out what she'd done I let my hate for her consume me, I began to wish the woman I loved was dead. I woke up every day imagining how I'd do it, what was the best way, what was the most efficient way. It's all I wanted. That woman was evil and deserved to be punished and so I killed her. And although that woman was the worst kind of evil I also know that killing her was wrong. I don't sleep much, I can't. I can't close my eyes without seeing it, that moment, the look on her face. She won't leave me. She won't.
At the end of the of this episode when Kiera gets stabbed with the Ice 5, her eyes get frozen over. This is the same effect that happened on season five on Angel episode "A Hole In The World" when Illyria (Amy Acker) was taking over Fred's (Amy Acker) body. Amy Acker also guest-stars in some episode of season five of Alias.
Music from this episode includes:
"Whoa Now" by Louque
"Fade Into You" by Mazzy Star
This episode averaged 14.00 million viewers.
Richard Speight Jr. previously co-starred in The Agency, another series about CIA agents. He played Lex, a geeky, somewhat Marshall-ish character.
This was originally the 5th episode of the season.
Sloane: He called it "Ice 5", and offered it to the Agency for ten thousand dollars.
In Kurt Vonnegut's book Cat's Cradle there is a special form of ice called ice-nine that had the ability to instantly crystallize water. In the book it brought about the end of the world when it was tossed into the ocean. Alias made a vague reference to this too, pointing out that putting a small amount of ice-5 in a city water supply could cause serious damage.
Kurt Vonnegut's most famous book is Slaughterhouse 5, so Ice-5 might be a combination of the Ice-nine from Cat's Cradle and the title of KV's masterpiece.