Continuity: When Detective Rodriguez splashes Malloy with his water pistol, a girl with a short skirt and red purse hurries by them. Half a minute later, when Malloy enters the car, the same girl walks by again.
Continuity: In the final scene, when Frannie is walking home from the lighthouse after escaping the killer, she is barefoot. When she reaches the garden of her apartment building, she is wearing sandals. When she reaches her apartment, she's barefoot again.
Continuity: When Franny sits down with Cornelius the first time and she opens her notebook, the "new word" he gives her is already written there, before he tells her.
Continuity: A few seconds after Malloy has removed Frannie's panties, she is still wearing them (while he fondles her stomach).
Continuity: When Malloy gives Frannie his card, she uses a pushpin to secure it on her wall. Later in a close-up when she is at Pauline's apartment holding Malloy's card, there's no pinhole in the card.
Continuity: When Franny and Cornelious are talking in the bar, Franny puts on her glasses. When someone drops a glass on the floor, Franny quickly turns to look and her glasses are gone. When she turns back to Cornelius they are back on.
Continuity: John Graham and Frannie are walking down the street, and John is walking his dog on a leash. The leash disappears briefly when we see John gesturing with both hands.
Factual errors: There is a typo in the credits - "transportation" is spelled "tranportation" (missing the "s").
Errors made by characters (possibly deliberate errors by the filmmakers): When Det. Malloy first meets Frannie, he says the day of the murder was Saturday the 15th. Later, when Frannie is in the car with Malloy and his partner, the partner says the date of the murder was the 11th.
Continuity: After Frannie and Malloy's first intimate encounter, Malloy is dressing as Frannie realizes she has lost one of the charms from her bracelet. Malloy is buttoning his shirt and working on putting on his tie. When he turns to help Frannie look in the bed, his shirt and tie are on perfectly. Yet the next shot has him again adjusting the shirt & tie with the collar up.
Anachronisms: Towards the end of the movie as Frannie is taken to the lighthouse, it is dark. There is however, a shot of detective Rodriguez taken from inside the lighthouse towards the door and outside it is daylight.