In season one, from episode to episode and scene to scene, Dr. Clementine Chasseur's USMC (US Marine Corps) tattoo moves randomly from her right to left upper bicep/shoulder. In some scenes on her left, others on her right,
Throughout the series Dr. Peter's first name, Johann, is pronounced as both Yo-hann and Yo-hahn.
Hemlock Grove is a town in Pennsylvania. Destiny Rumancek lives next door to a medical marijuana dispensary. Medical marijuana is not legal in Pennsylvania, so there are no dispensaries there.
Despite Peter's claim there are cities in the mid west who say soda rather than pop.