Opens with the quote, "He had killed man, the noblest game of all, and he had killed in the face of the law of club and fang." This is from The Call of the Wild by Jack London.
The camp's name Iron Hans (or 'Iron John') is a Grimm fairy tale, and it is the first time a Brothers Grimm title was used in an episode. Presumably the name was inspired by the tale beginning with a king sending out his hunters into the woods, plus the coming of age of the tale's protagonist.
At 6:23 we see mile marker 19 at the side of a road. This episode is the 19th of the season.
This is the first episode to share the same name with one of the Grimms' Fairy Tales.
The first murder is at mile marker 19, which is a reference to the episode being the 19th of the season.