This episode opens with the quote, "No man chooses evil because it is evil; he only mistakes it for happiness." This is from 'A Vindication of the Rights of Men' by Mary Wollstonecraft who also happens to be Mary Shelley's mother.
The name of the cemetery/funeral home Griffin and Wu pay a visit to is Hills & Mazy. Hazy Mills Productions is one of the companies who made the series.
The title of the episode is a reference to Ernest Hemingway's novel 'The Sun Also Rises'.
This is the first episode that Todd Milliner has written or co-written since coming up with the original idea for Grimm.
The picture of Robert Johansson, whose left arm is used in the experiment by the scientists, is of Bruce Lawson, who has been a key grip for Grimm since season 1.