Grimm

Whenever the episode includes a room number (hotel room, hospital ward or bed) or address, the number is the combination of the number of the season and of the episode

Each episode opens with a quote from various fairytales or folk stories, which relate to the episode in some way.

According to Kelly Burkhardt, the Grimm trait is not strictly hereditary. Some offspring of Grimms have it and others don't. Girls also realize it earlier than boys.