Russell Hornsby injured his leg (Achilles tendon) prior to shooting this episode and was written out as being "on vacation". He didn't return until 'Kiss of the Muse' two episodes later. This was the reason for wheeling him off set in his office chair.
Opens with the quote, "The demon came home, and he declared that the air was not clear. 'I smell the flesh of man.'", from the story "The Devil's Three Golden Hairs" by the Brothers Grimm.
Liquid nitrogen freezes at 63 K (-210 °C; -346 °F).
While nitrogen does freeze at about -346°F, it is stored in tanks as a liquid. The boiling point of nitrogen is about -320°F so the liquid nitrogen is at that temperature.
Ahead of the meeting with the Roma queen in Germany, Frau Pech, with a malicious smile, tells Adalind to "wear something warm". That expression ("Zieh' dich warm an!") can be a warning in German ("Prepare for the worst!")