Produced for a very modest $1.2 million, the film racked up outrageously large grosses in its limited release. Debuting in Detroit, it hit New York City at Thanksgiving and earned $3.109m, holding screens until the end of the year.
Had the film opened nationwide with the numbers it earned in Detroit, it was projected to have earned $13 million domestically in its opening weekend - which would have ranked it amongst the top grossing horror films of its decade.
When we first see Angela (in the convenience store) she is wearing cross earrings. Later in the movie when she is dancing with Stooge (and she has become possessed), her cross earrings are upside down. A popular sign of "the devil".