When Sam (Carmen Argenziano) points a gun at vampire Caleb Croft (Michael Pataki) and threatens to shoot if he takes one more step, Croft fearlessly takes that step. However, when the shooting starts Michael Pataki flinches at each shot seemingly in reaction to either the squibs on his back or those going off on the wall behind him.
The opening scenes of Croft's attack on Leslie and Paul and the police department's investigation of the attack are supposed to take place sometime between 20 to 30 years before the main events of the film (which take place decades later in the early 1970s), but the men's long hair and the cut of the detective's suit in these scenes are clearly contemporary to 1972 (the year of the film's release).
During the seance, Anne is groaning while Croft conjures up the spirit. The camera jumps back and forth between them, then goes to one scene that shows both of them. In this scene, however, even though the soundtrack continues to sound out Anne's groans, her lips are not moving.