Pifias

Axel shoots a hole through three video screens at the shooting range, but those holes have disappeared in future shots.

When the cop car is taking a sharp left turn during a chase, the red light falls from the roof and hangs from a cable. The passenger in the car picks it up half way and in the very next shot it is on the roof perfectly in place. Also, the same shot (of the unmarked police car taking a sharp turn with the red light dangling on its wire) is used again during a later chase.

When Axel jumps up and grabs on to the cement truck that Rosewood has commandeered, his pistol can be seen falling out of the back of his jeans. He later uses this same weapon.

After breaking into the gun club, Axel breaks the blade of his pocket knife while attempting to open a desk drawer. Billy then produces a switchblade that Axel uses to open the drawer. When he opens the drawer, the broken knife blade is nowhere to be seen.

When Foley decides to turn around to check out the house, there are cars visible behind him. When he makes his U-turn, there are no cars on the road.

Using super glue fumes to develop fingerprints creates a white fingerprint, not a black one.

The Camaro sitting in front of the gun club is a 1982 or newer Z28. The Camaro at the club during the shootout is an older model Z28, circa 1978.

At one point Murphy fires his pistol with the slide locked back, which is impossible.

At various times, Karla fires her revolver repeatedly. Several of her shots occur in pairs, at speeds not achievable by a revolver in human hands.

When Foley is in Rosewood's apartment and calls back to Detroit to get Jeffrey to cover for him, he only dials seven digits, when it would take 10 digits to call out of area code.

Bogomil gets chewed out by Chief Lutz for involving the FBI in solving "The Alphabet Crimes." But the diamond store robbery is the "A" crime; i.e. the first and only crime. How does anyone know (at this point in the movie) that there are going to be further "Alphabet Crimes"?

Because in robbing Adriano's jewelry store, the criminals leave a letter in an envelope with the capital letter "A" emblazoned on it, which would suggest that the first letter of the business played a part in its selection as a target and that there will be more to come.

It is revealed Dent is committing the Alphabet Crimes to make money for an arms deal. So why is he making major contributions to charity, as he claims at the party at the Playboy Mansion?

Because keeping a good face for the public makes it less likely people will think he's a criminal/smuggler.

During the first jewelry robbery, they force an employee to lock the front door. After the robbery Karla seemingly walks right out the door without unlocking it.

However, right after she shoots down the chandelier and turns towards the door, there are two more shots, and a gun flame visible; she shoots out the lock.

The license plate on Rosewood and Taggert's police car is 2GAT123. This car is completely wrecked while en route to City Deposit. Later in the movie, while en route to Empyrean Fields, the same license plate is seen on their new car.

License plates can be assigned to different cars. If the first police car was totaled, the Beverly Hills Police Department could have simply taken the plate from the car that was written off and applied it to its replacement in the fleet.

When Foley places the super glue cap inside the turtle's terrarium, the cover of the matchbook is open just a fraction of an inch, almost closed; However, after Foleys phone call, just a couple minutes, Foley returns to the covered turtle house and retrieves the matchbook, which is now fully open.

Matchbook covers will often drift open on their own if the top flap is not secured under the bottom part; during the time it was in the terrarium, the cover slowly opened up more.

When Foley picks up Bogomil's shoe, the exact area where it had been standing is perfectly clean, even though its sole is dirty. The soil has been poured over the shoes on the floor.

When Axel, Rosewood and Taggart are running the matchbox's fingerprint through the computer downtown, it identifies the print as belonging to Cain and prints out his dossier. Taggart takes the printout and read aloud "Charles Cain... used to be Charles Campos". If you look at the dossier carefully, it only identifies him as "Charles Campos" and there is no reference or mention to his alias as "Charles Cain" anywhere on the printout.

When Axel bends down behind a car at the oil fields to check out the color of the dirt, you can see it is obviously spread around just around the area behind the car. No where else in the parking lot is there red dirt.

When Freidman answers the ringing phone in Inspector Todd's office, no line on the push button multi-line phone was illuminated.

During the scene where Axel first visits the gun club, it is daytime. Out the window of the scene in the office where Dent and Cain are discussing killing Foley, you can see past the bushes that it is dark outside, and a daylight balanced light is providing the "sun" beam through the window.

Although the story takes place over a number of days, it's obvious that the three establishing shots of the exterior of the Beverly Hills Police Department building were all shot at the same time, as the same man is leaning on the sign, the same police officers are exiting the building, the same civilian is entering the building, and the same man is cleaning the sidewalk.

When Axel and Rosewood are in pursuit of the armored vehicle and come to a stop at a traffic jam, the street lights can be seen to carry on moving on the windscreen.

At the gun club, when Axel is offering his grooming services to Karla Fry, she is shown firing a revolver. But the sound effects of ejected shells hitting the floor after each shot can be heard. Revolvers don't eject their shells.

Before he is shot, Bogomil is seen leaving police headquarters in an Oldsmobile Cutlass Ciera, manufactured by General Motors. When he gets in and starts the engine, the cranking sound is that of a Chrysler product.

While Foley is floating in the swimming pool talking to his detective buddies, film crew and lighting can be seen in the reflection of his sunglasses in the close-up shots.

During the scene with Rosewood driving fast on the way to the depository and during POV shot looking out of the front windshield, a camera crane is visible shooting the scene from a different angle.

When Kane hands Jack (the hit man in the Camaro) the matchbook, Kane's cigar is lit, implying he has used the matches & might have left a print. But Jack's is unlit, which is why he needs matches. So even though it's not shown, he certainly uses the matchbook at least once during the day, and his prints should be on top of Kane's that night after the wreck. But in the terrarium with the superglue, only 1 perfect print appears.

In the oil field at the end of the movie, Axel is bent down on the side of the black limo. As he picks up the dirt you can see the reflection of a boom mic in the bottom half of the limo

At the gun club, Foley goes onto the shooting range to find Russ Fielding. Fielding is showing a woman how to shoot but she is not even close to holding the firearm properly. A firearms instructor like Fielding would know this and correct it, but he doesn't do so.

When Taggart tries chasing the cement truck on foot, the brake lights of the truck illuminate as it turns the corner. Later, during the chase, Axel asks Billy if the brakes work, and he replies saying that he hasn't tried the brakes yet.

Inspector Todd's first name is Douglas, yet on the door to his office the name reads G. TODD, Inspector.