As well as being "Rat Man" spelled backwards, the name Namtar is also minor Sumerian god associated with disease and pestilence.
Namtar was operated by Adrian Getley of Jim Henson's Creature Shop -- walking on a pair of stilts. The face was moved by Sean Masterson, better known for his work on Pilot.
Dave Elsey, creative supervisor for Jim Henson's Creature Shop, names Namtar as one of the weirdest creatures that he ever came up with for Farscape. Elsey turned down ideas that Namtar could simply be a man in a lab coat.
This is the first time we learn that Leviathan and Pilots are bonded together, and without the Leviathans, Pilot wouldn't be able to travel into space. This is shown in more detail in Season 2's "The Way We Weren't".
The Farscape universe expands in this episode as we learn about more Sebacean colonies outside the Charted Territories, many of which are encountered later in the series.
John Crichton makes reference to Josef Mengele, the infamous Nazi scientist who performed torturous experiments on living human subjects during the Holocaust.
John: How can you not be angry? Insanely angry?
Pilot: When one of my species is bonded to a Leviathan, we give our lives to the services of others. Ship first, then those that travel aboard her.
John: No matter what those aboard do to you?
Pilot: My species is incapable of space flight on our own. If we wish to journey beyond our home planet, this is the tradeoff we make for the chance to see the galaxy. I consider it a perfectly equitable arrangement.
Aeryn: How could you? Pilot is defenseless.
D'Argo: Compassion? From a Peacekeeper?
Aeryn: For a comrade. You attacked one of your own. Would you do the same to the rest of us?
D'Argo: Of course.
Rygel: Blue-assed bitch.
Zhaan: What did you call me?
Rygel: A blue-assed bitch.
John: It's a happy face.
Aeryn: They're food cubes.
John: See, the pattern forms a… Never mind.