The story concept for "The Plateau" was pitched by J.H. Wyman's nine year old son, Oliver. He receives a "Special Thanks" in the credits.
Another difference in the alternate universe: In our universe, oxygen tanks are color coded green. In the alternate universe, Olivia takes oxygen from a red tank.
The Observer stands on the pedestrian overpass near Milo Stanfield as he throws a bicycle from it.
The glyphs for this episode spell out: BREACH
When Charlie mentions a "Vulcan mind meld" this is yet another Star Trek reference. Leonard Nimoy, who played William Bell, played Spock and did the Vulcan Mind Meld.