Scott Bairstow didn't even read for the lead role of Hobbes. Chris Carter was already familiar with his work, having used the actor on the 'Miracle Man' episode on the first season of "The X-Files".
Despite its plot similarities, "Harsh Realm" was created and shot prior to the release of "The Matrix" (1999). It was aired, however, about three months after the release of the movie.
Thomas Hobbes is named for the philosopher Thomas Hobbes, who believed in predestination and that people are inherently selfish and power-hungry.
Hobbes' dog, Dexter, is named after the protagonist from the Harsh Realm comic book series upon which the show is loosely based.
In the original 6-issue "Harsh Realm" comic-book created by James D. Hudnall and Andrew Paquette, set in the future, a detective named Dexter Green was hired by a family to find their missing son, who disappeared into a "pocket universe" (created by scientists for travel purposes), this one being a fantasy world with wizards, warriors and dragons (much like "Lord of the Rings" or "Dungeons & Dragons"). The Fox TV series completely does away with the "fantasy" aspect and uses a setting similar to The Matrix (1999) (which was a huge phenomenon at the time).
The term "harsh realm" originates from the grunge speak hoax of 1992 when a sales representative from Sub Pop Records told a persistent New York Times reporter that the grunge kids in Seattle had their own terminology (they didn't) and that "harsh realm" was one of their key expressions (it wasn't).
James D. Hudnall and Andrew Paquette, the creators of the original "Harsh Realm" comic-book sued Chris Carter and the Fox Network for credit (they got no credit on the show) and won. Many wrongly speculated that this widely-publicized lawsuit brought about the series' sudden cancellation. It was actually a struggle between Carter and Fox that got the series cancelled.
In the final Ep., the date of the 'incident' is October 13. Consequently, Ten Thirteen is the name of the production company that produced "Harsh Realm".
The chair Hobbes sits in to enter Harsh Realm has "siege" and "perilous" on its armrests. This is a reference to the legend of King Arthur, and a similar chair that would turn anybody but the bravest person in England into ash if they sat in it.
Cancelled after only nine episodes were produced. Three episodes originally aired on Fox, the remaining six premiered on Fox's channel FX.
Unlike the comic book which is set in a high fantasy world, the TV series is set in a post apocalyptic wasteland.