Both hallways and bathrooms are mythological places in the series but in different ways. Mulder and Scully have had some of their most romantic moments in hallways and different characters had suffered hard moments in the bathrooms.
The voice tells me my sister is safe. It tells me everything will be okay.
Therapist: Do you believe the voice?
Mulder: I want to believe.
Throughout the series when we see a closeup of CGB Spender's/The Smoker's ashtray while he is extinguishing his cigarette, the filters of the "smoked" cigarettes already in the ashtrays are perfectly white, while they should be yellow/brown from the nicotine-smoke. This indicates that they are props, placed there before shooting and not cigarettes smoked by the characters.
Occasionally, the phrase "The Truth Is Out There" in the opening credits has been changed to something else, for example "Trust No One" or "Apology is Policy".
The 'previously on The X Files' segments are missing from the DVD Season boxset releases.