Linda Cropper and Peter Andrikidis worked together immediately prior to filming "Relativity" on the Australian TV movie My Husband, My Killer, with Cropper playing the wife in a reconstruction of a famous Australian murder case.
The jungle planet was entirely constructed on one of the sound stages at Homebush Bay - there was no location filming in any of Australia's native jungles.
Dominique Sweeney returned to Farscape as both the ill-fated Kek, seen briefly at the start of the episode, and Thek. He previously played one of the Halosians opposite Thomas Holesgrove in Season 2's "Out of Their Minds."
Linda Cropper damaged her knee the day before shooting this episode. But ironically, it was not the knee that is injured in the script!
This was the first episode that series creator Rockne S. O'Bannon had written for the show since the end of the first year. He was, however, Executive Consultant throughout the show's run.
Contrary to popular belief, the autopsied Rygel from Season 1's "A Human Reaction" was not recycled for the injured Hynerian in this episode.
Creature costume designer Lou Elsey based the Colarta's look on an Egyptian theme, to disguise the necessary zippers and seams in a different way from usual.
Composer Guy Gross used the score to deliberately emphasize the emotional struggle that Aeryn and Xhalax Sun were undergoing, rather than the physical battle that they were in the midst of waging.
Crais's yelp of pain is genuine when Crichton is manhandling him through the jungle. Lani Tupu stumbled just as Ben Browder was going through the motion of pulling his arm. Tupu insisted on repeating the yelp on subsequent takes.
Every form of special effects machine was in operation to create the jungle atmosphere - fog machines, dry ice, fire machines - all within the interior set.