After Hondo and McCabe's session at the SWAT training grounds, McCabe removes his sunglasses, yet they reappear on his head in the next shot.
When Hondo and Street assault the stationary subway train, there's a bright light shining on Street as he climbs the train, but Hondo's gun (and subsequently his torch) are pointed towards the ground.
In the last scene where the team receives the call up for the 211 at the Diamond Mart, Street puts on the headset for his radio on twice.
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 Deacon Kay chases the suspect towards the Crown Victoria he's wearing black shoes; when his foot is seen landing on the roof, he's wearing tennis shoes.
When the jet on the 6th bridge is stationary as part of the pre-take off check the pilot selects gear down which obviously would have been done before the aircraft landed.
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.
When Customs finds Montel's knife, they tell him to mail it home. Customs would never do this. If it was contraband, they would confiscate it, and possibly fine or arrest the owner.
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.
Dispatch claims the Hawthorne airport beacon is on "after closing
hours". Beacons are always turned on after sunset or when visibility is below three miles.
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.
During the shoot-off at the SWAT training range, T.J.'s M1911 pistol jams in the open position but he keeps squeezing the trigger and the gunfire is heard as if he was still shooting.
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 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.
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.
Deacon Kay's last name is misspelled "Kaye" on the tag on the back of his tactical uniform.
Boxer is supposed to be a seasoned snuff dipper yet when he spits into a cup he does it in a "bombs away" fashion, which creates a nasty splash. A true snuff user puts the edge of the cup to his lip instead and then spits.
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.
In the opening shootout, there is a shot of man running with a hand-held camera following a stretcher. This was an actual camera man trying to get shots of raw footage for the movie.
When Street is going to "blow" the lock off the sewer gate, you can see the cable pulling the gate off the hinges.
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.
In the final scene outside the S.W.A.T. van from the outside, the camera crew is reflected on the black paint and in the window as the shot tilts up.
When Chris Sanchez gets out of her car and runs to a wounded Officer Boxer, some of the camera crew's bodies and faces are reflected in her car door and window for a moment.
In responding to Hondo's question about what Street did while serving as a Navy SEAL, Street replies that "[his] boat crew leader always said if anyone knew what we did, we'd fail." A boat crew leader is a trainee position in BUD/S usually given to an officer or a more senior enlisted rank. It is not, as Street implies, a position in an active SEAL team and thus, not someone who would impart words of wisdom as to operation of a SEAL team.
During the press conference after the shootout, the Captain states the assailants were armed with AK-47's. One was armed with a Beretta handgun with suppressor and the other is a Tec-9 machine gun.
When asking what Street did as a Navy SEAL, Hondo says, "So, what did you do for them? Sniper detail? Amphibious assault?" ALL Navy SEALs specialize in amphibious assault; it is their primary mission. It is even in their name (SEa Air Land). Hondo, as a former Force Recon Marine, would know this already.
When Hondo bets TJ that Street would easily beat him (TJ) in the shooting competition, TJ seems to indicate that he is completely unaware of Street's former experience as a SWAT Officer (and thus would easily beat Street in the competition). There a few things that would make TJ's ignorance of this fact almost impossible: First, Street had only been off SWAT for 6 months at the time; not enough time to be forgotten by SWAT. Second, both Boxer and Hondo, at different times, indicate that they are aware of the rumor that Street ratted his former partner, meaning that the knowledge of the circumstances, and thus knowledge of Street being a SWAT Officer, were widely known. Third, LAPD SWAT is a relatively small unit of LAPD as a whole; most of the officers would know each other. It makes no sense that TJ wouldn't know that Street was not only a former SWAT officer, but also a former Navy SEAL, and thus quite a formidable match in shooting.