When Hondo and Street are talking in the garage, Street says: "Fuller will never sign off on it". Hondo replies "You let me deal with that paper-pushing PUNK". He originally said "prick" and was just dubbed over.
The scene where the helicopter is shot down with a sniper rifle, shows one of the helicopters rotors flying off and sticking in the area of the stair-well, however when it returns to the same camera angle, the rotor is gone but the hole is there.
When the squad is approaching the downed jet and firing upon the gunmen, one scene shows Hondo emptying his M1911. This is evident by the very last frame of the shot showing the slide on Hondo's pistol locked back, indicating an empty magazine. However, in the immediate next shot, he manages to squeeze off one more round from his empty gun.
When Gamble takes Alex and his fellow commandos down into the subway, the SWAT team reports into the radio that they went into the Pershing Square Metro Entrance at 7th & Hope. The Pershing Square station is at 5th & Hill Street. Also, a sign on the wall clearly states "Wilshire/Western" which is not near downtown LA were 7th & Hope is located. They also order the next station on the line to be closed. They say it is "7th & Figueroa Station" which would be correct if they were at Pershing Square, but not if the train is heading east. Eastbound trains would arrive at the Civic Center and/or Union Station stops depending how far they've gone. The trucks are seen arriving with the Wiltern theatre prominently behind them, which would make it the Wilshire/Normandie station (which *is* the next station after/before Wilshire/Western depending which direction you are going, but not near downtown).
TJ uses the brownish sedan with the license plate 2PCE058 to stop Montel from escaping in a police car during the bus escape sequence. During the crash, different angles show only the two cars crashing, a third car involved, then again a shot with clearly only the two original cars. Damage to the brownish car varies accordingly.
The same brownish car with 2PCE058 is seen later in the motorcade scene, undamaged. Although it is not explicitly stated how much time passed between Montel's capture and the transfer date, considering how desperate the LAPD is to get Montel out quickly, a repair of the car would not have been possible.
When they are escorting Alex into the secured area at LAPD we see the bandage on Street's ear from when Alex sliced him with a piece of glass. But in the shot inside of the jail, the bandage is missing.
While the team is going over the airplane simulation they are originally using a black rope. Nearing the top the rope is white and only the section tying off the harness is black. A slight change in camera angle and the rope is black again.
The female police officer in the last sequence inside the SWAT vehicle has a silver ring on her right thumb as she views a photograph of her daughter. In the following shot as she places the photo into her shirt, the ring is missing.
During the escape scene, different officers contradict each others orders. T.J. tells Montel to "put his hands on his head" yet a second later Boxer tells him "hands up". All the while, others are shouting for Montel to "get on the ground".
When Montel is captured after his escape attempt, he is being cuffed face down in the street yet when we see it on the news, it now shows him laying on the sidewalk, by Alex Trebek's star. He's then immediately moved to what appears to be a dark-colored transport vehicle. Its logical that he would have been moved from the original 'middle of the street' take-down position to be held until the transport vehicle arrived. But when the vehicle arrives at the station, its gold-colored, and being driven by Sanchez, who was standing on the curb when Montel was loaded.
When Gamble and Street are fighting in the train yard beside the bridge, engines/tugs are seen multiple times. First marshalling tug (#3077, with a rotating beacon) can be seen just after Street frees himself (it hoots 3 times). As Street is following Gambles tracks, he crosses over between engine #1201 and a tank car. As he hops off, you briefly see the tug #3077 again, coming towards him (duplicate frames from before?) Then as they fight in the boxcar, you see #1201 go past behind them, and finally once more, its pulling the line of cars that Gamble is killed by.
When the S.W.A.T members are shooting at the Learjet as it goes down the bridge, the flaps on the plane are first shown as being retracted. A few shots later, the flaps are extended, then retracted again later.
When the private jet is slowing to a stop after landing on the 6th Street bridge, in one shot, the flaps can be seen fully extended. A few seconds later, as the jet stops, the flaps are fully retracted. Generally, flaps on a jet do not retract that rapidly.
When McCabe and Gamble illegally transport Alex Montel at night alongside a car of his henchmen, the camera pans from right to left between the two moving cars. The shadow of the crane (or "cherry picker") needed to for such a moving shot is clearly visible along the sidewalk.
When the prisoners are being loaded aboard the L.A. Sheriff's Department bus, a deputy is seen shackling a prisoner's leg to a seat support. In reality, prisoners are never secured to any non-movable item. This is a safety issue.
An L.A. Times front page is featured, with a police corruption story in the first two columns under the "COLUMN ONE" header. In reality, "COLUMN ONE" stories are always exactly one column wide, and are features/human interest, not hard news.
During the "Polish" gunman standoff Hondo mentions that they have been called in on their day off, Sunday. LAPD Metro D-Platoon SWAT has 60 full-time officers who work on rotating shifts, thus removing the need to call in six officers on their day off for a routine job and earn them overtime and recall to duty penalty rates of pay etc.
At the scene where Hondo's team were called on a Sunday and where they were about to breach the rear wall of the house, an old lady with a dog was walking by the area and they were escorted off by another SWAT officer. This could not have happened since the SWAT had already secured the perimeter of the house and no civilian can get to the house that close.
The mine that was used in the sewers is a M18A1 Claymore mine. This particular mine is made especially to send shrapnel to anybody within range. So in reality, the mine wouldn't be enough to blow a locked door off its hinges, and there would be many pieces of shrapnel all over as well.
When Street first meets Hondo in the gun cage, Hondo states that he has modified the trigger of his duty weapon. In illegal for a California law enforcement agent to modify any part of his duty weapon. In reality he would have either not done it or not admitted to it.
The scene where the helicopter is shot down with a sniper rifle shows the sniper targeting the rotor mechanism, and firing an accurate shot into it. However, the wind generated from the rotors would interfere with the flight path of the bullet, making the shot very inaccurate. There is no way the rotor wash from a chopper could alter the path of a bullet fired from a .50 cal. rifle in the short span of time it would be below the rotors.
When the Learjet starts going down the bridge to take off, it takes over a minute for them to try and get the plane up. In reality, the plane would've been able to take off well before then. Later on, it shows the pilot pushing the throttle up more, which could be why the plane never took off. However, it'd make sense that they should have given it full throttle earlier on.
At the time of filming, LAPD SWAT never had a female member in its history. This is addressed when Fuller vetoes Sanchez's entry in Hondo's team giving "Sanchez is a woman" as the sole reason, despite the fact she has passed the SWAT exams twice. The obvious conclusion is that at the start of the movie the LAPD SWAT has no female members and that Sanchez is the first to get in.
When the jet is slowing down to a stop on the bridge, the two trucks have their 4 way marker lights on blinking. As the jet is approaching, you can see they are blinking several times faster than they were previously, or will be immediately following the jet stopping. This shows that the film was sped up in order to create the dramatic effect of the jet supposedly approaching at a higher rate of speed.
When T.J. McCabe runs the shooting course with Hondo, the first knockdown target doesn't fall. If you look between his left shoulder and the post, you clearly see a round hit the first target and knock it down as he aims at the second.
In the beginning of the film, Street drives Hondo in an unmarked police Crown Victoria. Although it was an unmarked car, the license plate still should have said CA Exempt and had all numbers on it, which it clearly didn't.
During the training montage in the Kill House, there is an overhead shot of one of the characters tossing a flashbang grenade into one of the rooms. The explosion and smoke cloud, however, can clearly be seen to originate not from the actual grenade, but from a previously laid FX charge almost a foot away.
When the Learjet has set down on the bridge, and is finishing its roll out, chains that drive the main wheels to make the plane move under its 'own power' can be seen on the jet. As the plane is then turned around, the chains are gone.
In the scene when Hondo is talking to Officer Burress about joining the S.W.A.T., there is a shot of the two talking with a mirror in between them. If you look at the mirror, then you can clearly see a large group of people staring at the characters, who are obviously bystanders watching the scene being filmed.
The goof item below may give away important plot points.
During the final fight Gamble is supposedly killed by having his head run over by a moving train, but in the after shot no blood is present around his body, and the body itself shows no signs of deformation that the train would with no doubt create.