"Sein und Zeit" is the original title of German philosopher Martin Heidegger's influential 1927 book "Being and Time."
Mark Rolston appeared in season 2's Red Museum (1994), which also discussed the theory of "walk-ins."
The show Bud LaPierre (Amber Lynn's father) is watching on the television is Harsh Realm, a short lived show also written and created by Chris Carter.
Megan Corletto (who played Amber-Lynn) shares her birthday with Gillian Anderson's daughter Piper Anderson-Klotz. She also played a character called Piper in Charmed (1998).
The production code was #7ABX10.