At the Christmas party, Helena's nail varnish disappears and reappears between shots.
The snow on the roof of the car disappears and reappears between shots.
Ross tells Berlin that he was able to quit smoking by betting someone he could do so. However, after Berlin and Helena arrive at the Christmas party, Ross lights and smokes a cigarette.
When Berlin is searching through Taylor's filing cabinet, his hands jump in position while flipping through the folders just before he finds the folder marked "Jennifer".
At the landfill, John Berlin (Andy Garcia) tells his co-worker he's going to leave and sets off. Then his colleague Freddy Ross (Lance Henriksen) asks him something about the murder weapon, a knife. John Berlin replies, but unexpectedly he sits again, back in his previous position, as if he never started to set off. This confusing picture error obviously crept in during the editing process.
In the bathtub scene, Helena is photographed with a conventional analog compact camera. The villain takes several pictures with flash without making any noise. This is quite impossible, because the mechanical shutter, the film transport and even the flash would make clearly audible noises, which a blind person with sharpened hearing would perceive all the more.
When Berlin receives the Teletype, regarding previous similar cases, it states all of above within 300 miles of San Diego. Neither Needles (approx 315 miles from San Diego) or Flagstaff (approx 488 miles from San Diego) fit that statement.
While Berlin is going through the file cabinet, he finds a notepad with three license plates that were investigated. One is registered to a 1959 Mustang Red. Mustangs were produced until 1964.
Ross tells Berlin that the reason Taylor does not like him (Berlin) is because Taylor believes Berlin stole his promotion. This cannot be true because Berlin was hired as a sergeant and Taylor is already a sergeant.
The premise of the film is that missing women are being murdered or disappearing within a 300-mile radius of San Diego, California. However, the initial discovery of a new victim and the setting of the film is in Eureka, California, which nearly 800 miles from the San Diego metropolitan area.
Obvious body double for Uma Thurman (Helena): her breast size is far greater when naked than when clothed.