The Japanese name for the creature, kinoshimobe, translates as "servant of the tree".
When Monroe says, "...the woods are lovely, dark, and deep," he's quoting the first line of the final stanza of Robert Frost's "Stopping By Woods on a Snowy Evening," which sets up the more famous final line, "And miles to go before I sleep."
The epigram consists of the final lines of a four-stanza poem called "A Poison Tree" by William Blake (1757-1827).
The name of the company doing the toxic dumping is G & K Waste Solutions. David Greenwalt & Jim Kouf served as executive producers on the show, and GK Productions was one of the companies who made it.
This episode marks the first time Jim Kouf has directed an episode of Grimm that was written by his daughter, Brenna Kouf.