Trivia: The Observer can be seen standing in a doorway as the car slams into Arlette and Alastair's vehicle.
Trivia: The glyph code for this episode is SECRET.
Flames are also (thermal) energy. However, when Peck arrives in the past, the flame unit on the hot air balloon continues to burn.
Walter: I, too, attempted the unimaginable, and I succeeded. I crossed into another universe, and took a son that wasn't mine. And since then, not a day has passed without me feeling the burden of that act. I'm going to tell you something that I have never told another soul. Until I took my son from the other side, I had never believed in God. But it occurred to me... that my actions had betrayed Him and that everything that had happened to me since was God punishing me. So now I'm looking for a sign of forgiveness. I've asked God for a sign of forgiveness. A specific one: a white tulip.
Walter: And if God can forgive me for my acts, then maybe... it's in the realm of possibility that my son, possibly, may be able to forgive me too.
Peter: (to Walter) I just got off the phone with Olivia, she said there was an incident on a train. And I know how much you like trains. Thought it might cheer you up.
Peter: Have you noticed anything weird? Olivia: Not yet, but give it ten minutes.
Walter: Take samples of this man's lung, brain, and skin. Something's not right here. Astrid: Yup, I think it's my paycheck. Walter: Hmm?
Peter: Yeah, I read that deja vu is Fate's way of telling you that you're exactly where you're supposed to be. That's why you feel like you've been there before. You are right in line with your own destiny. Olivia: Well, do you believe that? Peter: Mm.. no. It's a bit mystical for my taste. I never get them, myself. Maybe that's because I'm not on track with my own destiny.
Carol Bryce: Alistair sent me these about six months ago to proofread. He had hopes of seeing them published. Olivia: Uh, can we take them? Carol Bryce: They're only gathering dust here. But they are pretty dense. Most would say it's gobbledygook. Olivia: Well, I happen to know someone who is fluent in gobbledygook.
Alistair Peck: Walter, God is science. God is polio and flu vaccines and MRI machines, and artificial hearts. If you are a man of science, then that's the only faith we need.
Music: Are Friends Electric? (Gary Numan), The Sweetest Thing (Camera Obscura)
Blair Brown is credited but doesn't appear.
International Airdates: Canada: April 15, 2010 on ATV Australia: April 21, 2010 on GO! UK: April 27, 2010 on Sky One Latin America: April 27, 2010 on Warner Channel Sweden: July 8, 2010 on Kanal 5 Germany: September 20, 2010 on ProSieben Poland: January 7, 2011 on TVN Finland: January 19, 2011 on MTV3 Czech Republic: February 11, 2011 on Nova Cinema
S 4 : Ep 22
Aired 5/11/12
S 4 : Ep 21
Aired 5/4/12
S 4 : Ep 20
Aired 4/27/12
S 4 : Ep 19
Aired 4/20/12
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