When Walter and Peter explain to Astrid about the radiation, Walter is shown writing on the blackboard. John Noble is left-handed, nevertheless we see him writing with his right hand in the closeup. When the angle switches he's writing with his left hand, as always.
Timur is transformed into ash, but the weight of the cell phone he's holding doesn't cause his hand and everything below it to break loose. Instead, the much lighter breeze from the fan causes him to fall apart a few seconds later.
Despite the fact that he is last seen standing up and being startled by a shadowy creature, when Randy's corpse is found: he is seated calmly and peacefully.
Trivia: The Observer can be seen at the airport to the right and behind Broyles as he talks to Olivia on his cellphone.
Trivia: The glyph code for this episode is DEJAVU.
Astrid: So this thing followed him from the hospital? I'm not going to sleep for weeks.
Olivia: Walter, do you have any thoughts?
Walter: Reminds me of Christmas. Like a fire log that burns so hot it remains intact., holding the shape of its former self. You used to love that when you were a child. You'd poke the log with your little finger when it had cooled, and you'd draw genitalia on the reindeer decorations.
Peter: Happy memories, Walter.
Peter: Are you suggesting that this was some sort of Russian experiment?
Walter: Because they're from the other side of the world, Peter, is it so hard to believe they have their own stripe of the inconceivable? Really I'm always amazed at their advancements even 40 years ago. You wouldn't believe what those pinkos were up to.
Broyles: I took the job to make the world a safer place for my family. Instead, I lost them.
Music: Freezing (Mozella), Straighten Up and Fly Right (Nat King Cole), Una Furtiva Lagrima (Mario Lanza)
The cartoon the girl watches is Kimba, the White Lion (Janguru Taitei), a Japanese anime series from the 1960's, created by Osamu Tezuka.
UK: November 8, 2009 on Sky1/Sky1 HD
Latin America: December 1, 2009 on WB
Sweden: January 7, 2010 on Kanal 5
Australia: January 27, 2010 on GO!
Germany: April 19, 2010 on ProSieben
Poland: October 14, 2010 on TVN
Finland: October 27, 2010 on MTV3
Czech Republic: January 7, 2011 on Nova Cinema
Slovakia: April 16, 2012 on Markiza
Blair Brown is credited but doesn't appear.
As of this episode, Kirk Acevedo no longer receives show star credit.
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