Blooper

The green Oldsmobile Cutlass Supreme coupe (a 1970 model) switches to a 1969 Cutlass hardtop coupe during the climax.

(at around 15 mins) Teri comes back with the oil asked by Rick. He is working on the motorcycle, and wears protective glasses. While Teri grabs him to the chair, we see he's removing the glasses and holds them in his left hand. A second later, in the close shot, the glasses have disappeared.

When Teri is untied from the chair where she was being electrocuted, the rope tying her right elbow to the chair arm falls off before she even touches it.

When the woman driving the topless station wagon chases Teri, she is talking to her male helper in the passenger seat, but her lips don't move in sync with the audio.

A stunt rail (which obviously caused the Chevrolet Chevelle to corkscrew) is barely visible on the left-hand side of the Mercury Marquis.