The vases and tiles used were created entirely by the production department.
Although this is credited to Jeff Vlaming as writer, the concept behind this episode - a pyramid scheme for body parts - came from Chris Carter.
A novelization of this episode by Ellen Steiber was released under the title Hungry Ghosts.
During the inspection of the cremation chamber when detective Neary is explaining to Mulder and Scully that they've had a recent influx of Hong Kong native before 1997, he's likely referring to the handover of Hong Kong from the United Kingdom to the People's Republic of China which was scheduled to happen on July 1, 1997.