The actor portraying Hill, Kenny Kalinowski, may or may not have actually eaten human flesh in Episode Five: "From Skin to Bone."
The whiskey in Hill's bottle is actually a cold, watered down coffee concoction that almost made Kenny Kalinowski ill during the shooting of Episode One: "Whiplash."
While shooting the public bathroom scene in Episode Seven: "Day of the Snake," production was interrupted by someone wanting to actually use the toilets.
If you take a close look at one of the crime scene photos in Episode Three: "Slit Eyeball," you will notice Ed Thompson as a victim, who is also portraying Agent Friar.
It was very cold and wet while shooting the camp fire scene in Episode Two: "Safe House," so gasoline was used as an ignition source.