After the doctor receives the threatening note, Olivia says she is going to send a copy to the documents department so "They'll analyze the handwriting, the paper, and the ink." They couldn't analyze the paper and ink from a copy.
Trivia: The poster on the wall during Peter's dream is of the 11th mission of space shuttle Challenger in June 1984. In our universe, the Challenger was destroyed during the launch of its 10th mission in June 1986.
In much of the episode, sleep is said to be generated from the thalamus and the computer probe is said to be implanted there, upon which activation of the probe renders the subjects into a dreamlike state to perform violence. However, the thalamus is regarded as the relay center of the brain, sort of like a neural switchboard. Deeper REM sleep, in which dreams are largely present, is actually actively produced by several sets of nuclei in the pons, which is located below the thalamus closer to the brainstem.
Trivia: The Observer can be seen at the Nayak Sleep Clinic, walking down a flight of stairs in the background as Olivia stands at a balcony.
Trivia: The glyph code for this episode is BETRAY.
Walter: Don't worry, Son. I promise to wear my shorts to bed so that if you bring any young ladies home, there won't be any embarrassing moments.
Walter: The ride back was invigorating. The turbulence over Ohio was like being in the belly of a seizing whale. I screamed like a little girl.
Astrid: I'm sure that went over well with the rest of the passengers.
Kashner: (watching a skull cracking) Do this kind of thing often?
Astrid: Brains? No. Although Walter gets particularly excited whenever we do.
Walter: I need help putting this on.
Astrid: Walter, I do not think this is a very good idea.
Walter: Don't be such a grinch. I've told you science should be fun.
UK: November 1, 2009 on Sky1/Sky1 HD
Latin America: November 24, 2009 on WB
Channel Sweden: December 17, 2009 on Kanal 5
Australia: January 20, 2010 on GO!
Germany: April 12, 2010 on ProSieben
Poland: October 7, 2010 on TVN
Finland: October 20, 2010 on MTV3
Czech Republic: December 24, 2010 on Nova Cinema
Slovakia: April 9, 2012 on Markiza
Music: From the Beginning (Emerson, Lake & Palmer)
Kirk Acevedo is credited, but only appears in a picture during the episode; when Olivia is telling Peter about how she met Charlie.
Peter: There is also a copy of Max Planck's book on entropy in his backpack that should keep him busy for a couple of hours.
Dr Max Planck, PhD (1858-1947) is widely held as the founder of Quantum Theory. He won the Nobel Prize in 1918. The book Peter is referring to is most likely Entropy and Temperature of Radiant Heat, which was a 470-page paper published by Planck over a series of months in a German physics journal. It was translated by physicist Morton Masius and compiled into a book and published in 1989 by The American Institute of Physics.
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