The opening quote, "Only you shall not eat the blood; you shall pour it out on the earth like water," is from the Bible, Deuteronomy 15:23.
Wicca and the Order of The Golden Dawn are both incorrectly referenced in this episode. Hank Griffin states that both existed in the 18th century, at least a hundred years prior to their existence in reality. Wicca was invented by Gerald Gardner in the 1950s, whilst the Order of The Golden Dawn is a secret society founded in the late 19th century. Contrary to popular belief, neither is related to actual witchcraft or any historical witch trials.
The Black Claw recruiter (Jesse Collver) is named Donald "Donnie" Jones which is the same name of Silas Weir Mitchell's character in My Name Is Earl (2005).
This episode officially marked Season 5 as being the deadliest season of Grimm yet, surpassing the 75 total deaths in Season 3.
The introduction sequence included new footage of Eve woging.