For Grog's massive belch in the palace of Emon, the main actors took turns drinking soda and recording their burps. The best ones ended up being from Laura Bailey and Marisha Ray, whose belches were combined and used in the final scene.
The composer for the show, Neal Acree, was so enthusiastic for the job that he privately composed a version of the theme song, and hired an orchestra to record it. He sent the track to the producers, who were so impressed that they hired him for the show.
One of the groups of mercenaries listed as killed by the unknown threat is "The Murder Hobos." This is a term used in tabletop gaming to describe characters who use unnecessary or excessive violence to solve all of their problems.