The black crow and the name of the town is a direct reference to the demon and 7th spirit of The Lesser Key of Solomon , Aamon
The aerial view of a town shown in the first clip of the opening titles montage is not a town in Ohio, or even the United States. It is part of a town in the United Kingdom. Tell-tale signs include the style of houses and gardens, the street lighting, the European car models and - most conclusively - the British-style road markings, including a bus stop and a "driving on the left side of the road"-style "give way" junction marking.
Both Emily Deschanel and Gerardo Celasco were in Bones. Deschanel played main character, Dr. Temperance Brennan and Celasco played in two episodes of the final season as Mark Kovac, a man who wanted to kill Dr. Brennan's family.
Of the 68 cast members, 27 have appeared in Supernatural. From young "Dean" to the angel "Gadreel" to "Demon #3".
There is a "Wicked" poster in the girl's bedroom and they watch the movie "Vertigo". Both are stories with related themes to "Devil in Ohio".