Goofs

After Jack gets out of his vehicle to go into the train station to try to find Sally, he leaves his Jeep door open. When he comes out and gets back in the door is closed.

Manny Karp's cigar jumps from his mouth to his hand as he sits Sally down during their conversation in his apartment.

The rear portion of the car sinks below the surface of the water twice between shots.

Jack (John Travolta) cuts out a number of pictures of the car crash from the magazine and uses them to produce a 'film' of the event. As the frame rate to perceive motion should be at least 24 fps, if not more, the result of Jack's 'film' would have been much poorer than suggested.

When the sailor follows the prostitute into the phone booth, there's the audible sound of his zipper being opened. Those enlisted Navy dress blues contain no zippers, but have a rectangular panel in front, held by 13 buttons.

As the Burke character (John Lithgow) speaks to his contact from the "secure" public phone in downtown Philadelphia, the same maroon MGB convertible is seen directly across in the same metered space throughout the conversations that take place on different days.

When Burke murders a girl who looks like Sally, to establish the fictitious serial killer's MO, and turns her over to look at her face, the dead girl blinks. In the next close-up of her neck, it pulses just as the film cuts to a distant shot.

When Jack dives into the water to save Sally, one can see Manny Karp standing under the bridge. From that spot he could never have taken the pictures of the car crash that he sold to and were published in the magazine.

(at around 76 mins) When Sally smashes a bottle of whiskey against Manny's head, only broken pieces fall on the bed, but no liquor is poured, indicating the bottle was in fact an empty movie prop.

Film crew visible during overhead shot after Jack crashes through police barricade.

(around 1 hr. and 38 min.) Camera shadow visible on the ambulance when Jack escapes.

In the pre-credit "slasher movie" sequence, the shadowed reflections of both the "slasher" (intended or, at least, credible) and the camera operator and his Steadicam (unintended) can be seen in the tile wall to the right of the showering girl. Perhaps the reason the girl was hired, as explained to John T's character in the projection room by the film's producer, was thought to be a sufficient distraction so as to preclude a retake.

When Jack (John Travolta) is running to rescue Sally (Nancy Allen) he runs through 30th Street Station. When it cuts to him running to the top of some steps, he's at 15th Street station.

The sound mixer for the slasher movie mutes all of the sounds except the scream of the girl in the shower, in order to prove that it's really her voice. In fact, what he proves is that she's been dubbed: if it were really sound from the location he would not have been able to eliminate the shower or its curtain being pulled aside, as the microphone would have picked them up too.

Jack plows through a parade in his Jeep, then crashes into a store. He is later able to escape from an ambulance undetected, but there should be several police officers wanting to question him and preventing him from leaving the ambulance.

When the main character pulls Sally out of the car and to the shore, she is clearly keeping her head up above the water and not lying back like she is passed out.

When Manny is wrestling with Sally on the bed, he says "Relax, Nancy", using the actress's name.