When the newspaper salesman becomes afflicted, he stumbles over a newspaper stand and immediately following that The Observer steps out of his way.
The glyphs in this episode spell "Olivia".
First mention of the drug 'Cortexiphan' which plays a large role later in the series.
The episode opens in Wissenschaft Prison, Germany. In German, "wissenschaft" means "science".
Both light boards have 47 lights, and the bomb is found on the 47th floor. As this episode deals with teleportation, the repetition of 47 is a reference to the Star Trek universe, where the number 47 appears again and again.