Clear and Wesen Danger - S5-E2
Corrected entry: Marshal says " just gassing up, about to get on the 405." The 405 is a freeway in Southern California, not Portland Oregon or Northern California. (00:29:10)
Revelation - S3-E13
Corrected entry: A plot-important jeep from Kansas is identified by its front license plate. It is a Kansas plate, but Kansas does not issue front license plates.
Clear and Wesen Danger - S5-E2
Corrected entry: When Adalind gets worried about what her son will become she asks if he might be "A Hexengrimm or Gimmabiest." Since he is male the correct reference would have been a Zaubergrimm. (00:32:40)
Correction: They weren't being serious with the names, plus since they don't know the true name this shouldn't be considered a mistake.
Correction: While there is an I-405 in California, there is also an I-405 that runs through Portland.