Due to the original The Brady Bunch (1969) set having been long ago disassembled, the elaborate house set was built completely by the production crew.
Scully says that she has worked on the X-Files for 9 years and worked on about 200 cases. This is the 200th episode of the series. Scully has appeared in the most episodes of all the main characters.
This is the final standalone/monster-of-the-week episode of the X-Files' original unbroken run.
Gillian Anderson was a big fan of The Brady Bunch (1969) when younger. She said seeing the house recreated in the flesh was "wild".
Vince Gilligan: [idiots] The beer-drinking idiots in the first act are similar to various stock characters in Gilligan's later show Breaking Bad (2008).