Seth shoots Mark with a rifle, but blows his head off as only a shotgun would do.
Mark rips off Jen's jeans and black panties; she's later seen wearing white panties.
Marks stabs to death the convertible driver at the gas station, and the victim bleeds profusely. Yet, later on when Mark carries his body into the trunk of the car, there are no blood stains on the floor.
In the very last sequence, after Seth is shot by the police, the position of the rock on the ground does not match with Seth's position when he was holding it over Jen's head.
October 13th, 1987, was Tuesday, not Friday, as the reporter stated.
A cash register at Jen's diner has a flat screen monitor. These didn't exist in 1989.
A few cars from the mid-'90s can be seen in some moments. The movie takes places in 1987 and 1989.