The Observer waits behind the crime scene tape outside of victim's house when Olivia arrives.
While driving with the shape-shifter, Malcolm Truss stops for gas at "Newhart Gas" in Rutland, Vermont. The TV series, Newhart (1982), takes place in Vermont and the inn that posed as the one owned by the characters is about 30 miles from Rutland.
The glyphs for this episode spell out: STILL
Nadine retrieves her typewriter from locker number 47. The number 47 features prominently both in "Fringe" and in Abrams' previous series, "Alias".