When Peter leaves the convenience store while searching for Olivia, there is a sign for Slusho Brand drinks. This is a recurring easter egg in JJ Abrams Productions, most notably as a tie-in with his film Cloverfield.
The glyphs for this episode spell out: HENRY
Walter, speaking to a facility resident, says, "I said 'Tim, it's not what the LSD can do. It's what the human mind can do that is truly wonderful.'" This is likely a reference to Timothy Leary, a clinical psychologist and writer known for his strong advocacy of psychedelic drugs. In the early 1960s, Leary ran studies on the potential therapeutic effects of psychedelic drugs such as LSD.