All of the bar scenes (including a murder scene) were filmed in Foran's Grand Trunk Pub, one of the oldest pubs still in operation in the city of Detroit. One unique fact about Foran's is that the famed magician, Harry Houdini, kept an office in the basement of the pub.
At 35:17 when Sam is in the greenhouse with Harry, Harry warns him not to sniff a particular flower and tells him it is "Burundanga, Devil's Breath." Burundanga is another name for Scopolamine, a drug that is found in several plants in the nightshade family including datura (jimson weed), hensbane, and the plant shown in the film - Brugmansia, also called Angel's Trumpet.
Mia Serafino's debut.