Opens with the quote, "Oh! There is a terrible witch in that house who spewed her poison over me and scratched me with her long fingernails.", from the Brothers Grimm fairytale "The Bremen Town Musicians".
Adalind and her associates are in hotel room #212. This corresponds to the episode: season 2, episode 12.
Russell Hornsby (Hank) said in an interview about this episode that at one point he felt like the character from The Bone Collector (a paralyzed man who directs a younger police officer through an investigation from his bed); after Grimm, The Bone Collector was remade as a TV show with Russell Hornsby playing the main character (the paralyzed detective) and Claire Coffee (Adalind) playing the unsuspecting wife of the titular serial killer.
Claire Coffee (Adalind Schade) was credited as a star for the first time; her credit was centered at the bottom of the screen instead of being in the lower right, as the others were. She was a series regular from this point forward the end of the show.
This was the first episode to not credit any guest stars.