Opens with the quote, "Whilst he thus gazed before him, he saw a snake creep out of a corner of the vault and approach the dead body.", from the Brothers Grimm fairytale "The Three Snake-Leaves".
Bree Turner is very clearly pregnant with her second child during this episode.
According to Angelina's file, Monroe lives at 418 Ravensview Dr., Portland OR.
This episode marks the final of 3 episodes that Sergeant Wu doesn't appear in. (The previous 2 being 1x11 & 1x12). From the next episode (2x7) onward, he plays a part in every single episode.
"Königschlange" comes from the German words "könig," meaning "king" or "royal," and "schlange," meaning "snake;" given the name and the hood, likely meant to resemble a king cobra.