It won an Emmy Award for Outstanding Makeup for a Series.
Strawberry jam, among other things, was used to create the effect of shedding flesh.
Plans were in place to bring back Laurie Holden as Marita Covarrubius, but her filming schedule (she was shooting The Majestic (2001) at the time) prevented that.
Fox Mulder was raised in and occasionally returns to Chilmark, Massachusetts, but his family burial plot is in Raleigh, North Carolina.
Scully uses a combination of antiviral drugs to kill the alien virus within Mulder that threatens to turn him into an alien super soldier. This seems to be the reason why only Scully still has alien DNA while Mulder no longer does, as seen in the Season 10 premiere My Struggle (2015), the Season 10 finale My Struggle II (2016) and the Season 11 premiere My Struggle III (2018).