Grimm (2011)
0 character mistakes in show generally
Starring: David Giuntoli, Russell Hornsby, Sasha Roiz, Silas Weir Mitchell, Bitsie Tulloch
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Character mistake: Raymond refers to his equipment as EMF (Electromagnetic Fields), except it is labelled as EMR (Electromagnetic Radiation).
Nick Burkhardt: I guess you don't have to be a hexenbiest to be a witch.
Adalind Schade: You don't have to be a witch to work this kind of magic.