Most, if not all, of the references and names are derived from German terms or real scientific terms. For instance, "Blutbad" means bloodbath, "Hexen" means witches, "Schaden" means misfortune or misery, and "mellifer" means honey-carrier. The terms are, however, not original German terms for mythological creatures. They've been made up for the series and most of them are "incorrect" German. Despite the NBC page translating "Schneetmacher" as a cold, evil person, for example, such a word does not exist in German. The queen of the mellifer is referred to as "Mellischwuler", which, translated, means "Melli-gay man" - a possible explanation for this might be that the word "queen" was mistyped "queer" when the word was looked up in a dictionary. Many "Wesen"-names are made up compound nouns, but often grammatically incorrect. Examples for this are the "Bauerschwein", "peasant pig", which -correctly composed- would be a "Bauernschwein" (in any case another creature name that does not exist in the German language of any time period). The same goes for "Spinnetod", which, correctly composed, would be "Spinnentod" (spider death). The right plural for Blutbad (blood bath) would be "Blutbäder". In the pilot episode, the Reaper Hulda carried a scythe that read "Erntemaschinen der Grimms", which translates as "Harvesting machines of the Grimms".
Neither Wu nor Monroe are referred to by their given names.
Each episode opens with a quote from various fairytales or folk stories, which relate to the episode in some way.
The basis for this episode and the origin of the opening quote comes from "Little Red Riding Hood."
The basis for this episode and the opening quote come from "The Story of the Three Bears."
The basis for this episode and the opening quote come from "The Queen Bee."
Doug is wearing a shirt that has black and yellow lines on gray and white-ish base. His cell phone has a black-and-yellow shell. The queen is dressed all in black and yellow. All references to the colors of bees.
The basis for this episode and the opening quote come from "Bluebeard."
The episode's title comes from Camille Saint-Saëns piece of music by the same name. It is also played by the musicians in the story.
The basis for this episode and the opening quote come from "Pied Piper of Hamelin."
In this episode, Angelina, a Blutbad, mentions being with someone named Adam Hauptman. Adam Hauptman is the name of an alpha werewolf from the Mercedes Thompson series written by Patricia Briggs.
The basis for this episode and the opening quote come from "The Three Little Pigs."
The piggy arson investigator is Paul Orson, a nod to the Latin taxonomic term "porcine," meaning pig.
The basis for this episode and the opening quote come from "Rapunzel."
The episode title is a pun on the name of John Steinbeck's 1937 book "Of Mice and Men". It has been filmed in 1939 (cinema), 1968 (TV), 1981 (TV) and 1992 (cinema).
Amy Acker, who guest stars in this episode also starred in the series "Angel" which was co-created by Grimm's co-creator David Greenwalt.
The plot alludes to the classical tale of Androcles and the Lion, though it doesn't follow to the same outcome.
The opening quote comes from Aesop's fable "The Slave and the Lion".
The Newspaper article referring the the crash on Highway 9G is attributed C David Hall-Cottrill. Cdavid Hall-cottrill was Property Assistant on this episode.
The letter from the Office of Strategic Services is signed "W. Donovan." William "Will Bill" Donovan was the director of the OSS during World War II. He was also a World War I Medal of Honor recipient and co-founder of the Central Intelligence Agency.
The Newspaper article referring the the crash on Highway 9G is attributed C David Hall-Cottrill. Cdavid Hall-Cottrill was Property Assistant on this episode.
The opening quote comes from the fairytale "The Master Thief".
The opening quote and loose plot come from the fairytale "The Two Brothers".
When Sgt. Wu Reggie Lee is shown sitting on the sofa in his house there is a poster on the wall behind him for a fictional movie, "3 Calls to Murder", starring Tyler Beem and Doreen Vantyne. Director Rob Bailey had worked with Tyler Beem on other TV series, and Doreen Vantyne is a member of the Grimm Makeup Department.
The opening quote, and loose plot are from the fairytale "The Donkey Cabbage".
The opening quote and some loose plot points come from the fairytale "The Nightingale".
The opening quote and loose plot come from the fairytale "The Donkey Cabbage".
The opening quote and some loose plot points come from the fairytale "Iron Hans".
The opening quote and some plot themes come from the fairytale "Three Billy Goats Gruff".
The title quote and loose plot come from the classic fairytale "Cinderella".