Opens with the quote "In all chaos there is a cosmos, in all disorder a secret order", from the work "Archetypes of the Collective Unconscious" by Carl Jung.
Nick finds out how Wesen know he's a Grimm when they woge in this episode.
The aircraft used to fly Kelly Burkhardt, Adalind, and her baby out of France to Portland had its registration number changed. The initial letter was changed from N (the designation for USA - N for National) to G (for the United Kingdom - G for Great Britain). You can clearly see pasted-on panel containing the letter G. The aircraft is a famous Douglas DC3A.
Footage from "Love Sick" and "The Kiss" was reused (flashbacks).
The episode title, just like the opening quote, comes from Carl Jung and his philosophical concept of synchronicity, which is referenced by Juliette.