Continuity mistake: When Juliette comes back from being in a coma, it is made to seem like they only have 1 bedroom upstairs as Nick stays on the sofa for a while before moving in with Monroe. However, later in the series, when Trubel comes in, she stays in their guest bedroom.
Grimm (2011)
1 continuity mistake in season 2 - chronological order
Starring: David Giuntoli, Russell Hornsby, Sasha Roiz, Silas Weir Mitchell, Bitsie Tulloch
Twelve Days of Krampus - S3-E8
Visible crew/equipment: During a fight scene between Nick and the Krampus you can see a man running out of the shot. This is the part of the fight just after the kids are being lowered from the tree.
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.