The yellow Porsche is damaged in the side collision with the red convertible, but when Matrix flips it upright and drives off in it, the side is undamaged.
When Matrix is gearing up to go and find Jenny, he paints his arms and face with camouflage paint and then puts on his combat vest and you see his chest is unpainted. Yet later on when he gets caught in the grenade blast and takes it off, his chest is painted.
When Matrix flips the Porsche upright, the left side is damaged, but when he drives away in it it's not. When he pulls up outside the sunspot motel it's damaged again.
When Matrix is raiding the surplus store, and enters the hidden room full of guns, he grabs the rocket launcher off the wall and hands it to Cindy. After he says "Go!" and she leaves the room with the rocket launcher, the next shot of Matrix shows it hanging on the wall again.
When Matrix enters the shopping mall, it's daylight. When he leaves only a few minutes later, it's dark outside.
When Matrix crashes his car while chasing Sully, neither Matrix nor Cindy are affected by the crash even though neither are wearing seat belts (Cindy isn't even in a seat!), and the crash was powerful enough to severely damage the front end.
When Cindy fires the rocket launcher the second time, the recoil knocks her back. But when she accidentally fired it backwards the first time, there was no recoil.
When Matrix and Cindy are looking at the fuel receipts Cindy says "that's amphibian" fuel. There is no specific fuel type for amphibious airplanes. Even as a student pilot Cindy would have known this.
When Matrix escapes from the aircraft during take-off, he leaves doors open and breaks down sealed curtains. This would set off alarms in the cockpit and leave the aircraft unpressurized in flight; and therefore unable to complete an 11hr flight.
A flight attendant tells Matrix that the plane will land in Val Verde in "exactly 11 hours" and makes no mention of a refueling stop somewhere en route, either during that conversation or in the public address announcement made moments before. However, the aircraft in question is a McDonnell-Douglas DC-10-10, which has a maximum range of 3,800 miles or about 7 hours.
Matrix, after pulling Sully from the Porsche, practically shouts his name, very clearly. Cindy was about 20 feet from them, but could have clearly made his name out.
When Matrix is hit by Sully's Porsche it looks like his wallet falls out of his pocket. However, it is actually the side mirror being knocked off.
When Sully buys the passports in the mall restaurant, he puts them in his pocket, but when he leaves to see whats happening outside in the mall the envelope the passports were in is clearly sitting on the table.
However, in the previous shot, Sully removed the passports from the envelope and put them into his jacket pocket without it, which would explain the empty envelope being left on the table.
When the red car slams into the lamppost after the chase with Sully, the head of the "Cindy dummy" flies off.
When Matrix blows up the building at the end, the soldiers chasing him can be seen wobbling. They are all clearly cutouts.
When Matrix is climbing up the cliff at the island, you can see that the shotgun on his back is made out of rubber.
In shots of the seaplane near the island you can see the struts of the landing gear indicating that the gear is extended to the down position. However, in a water landing the wheels would remain retracted. The wheels would only be extended if they planned on taxing the plane up a ramp onto dry land. This probably indicates that, for easier filming of those static shots, the plane was parked on its wheels on a slipway rather than further out at sea as it is supposed to be.
When Matrix and Cindy are about to take off in the plane, the daylight varies: when they are filmed from outside it's about to get dark, from inside it's the middle of the night and then it's about to get dark again.
When Matrix blows up the buildings on the island, you can see that the soldiers standing in front of the buildings are dummies. Most likely since you could not do those explosions without actually killing someone.
It's never revealed what Bennett did to get kicked out of Matrix's unit.
When Matrix is about to kill Sully, Sully pleads that Matrix needs him to find his daughter. Matrix then responds, "Where is she?" but the closed captioning says "Open the door" and is distorted.
It's seems almost laughable that Arius thinks that making matrix go to his country murder the current president and come back in one piece to get his daughter would happen how on earth could anyone get close to any sitting president friend or family to commit an assassination if anything matrix would have been immediately arrested and thrown in jail for trying to get anywhere near a sitting president without an invitation to meet of some sorts..
When Matrix tells Cooke that "I eat Green Berets for breakfast" you never see his lips move when he says "But right now I'm very hungry."
The scene where Bennet and Matrix are fighting towards the end of the movie, before Matrix kills Bennet they have each others throat in their hands and one of their backs is against the furnace. While they are grunting and groaning, if you listen carefully, you can hear one of them say "switch" just before they change positions.
The military helicopters used in the movie are turbine-powered Bell Jet Rangers but the rotor/engine sound is from the older, piston powered models such as the Model 47 that are used in M*A*S*H.
When Arnie sets his stop watch to count down from 11hrs, each second that the watch ticks over there is a loud 'beep'. This is consistent with when he looks at his watch later in the mall, when it reads 9hrs 40mins to go, his watch is still beeping every second. Therefore, Arnie's watch should have been beeping every second of the movie in between these two scenes, but we never hear it. Also, when Arnie and Cindy arrive at the Sunspot Motel (7hrs 57min to go) and when Arnie's in the back of the police wagon, at 5hrs 2min to go, the watch no longer beeps with each passing second.
During the final battle on the island, gunfire can be clearly heard in the background, yet Matrix is the only person shooting.
When Matrix is hanging Sully over the edge of the cliff with his "good arm" the rig and cable attached to Sully's ankle is clearly visible.
Around 1:11:11, during explosions, we see that men are in fact mannequins cause they didn't move.
In the final battle scene, several times when someone is blown into the air by a grenade you can see the ram that throws them into the air.
When Matrix pushes his car off of the cliff you can see a large rope attached to the back of the car.
After Matrix holds up Cindy for the first time, Cindy drives off and the crew is reflected in Matrix's side of the car.
When Matrix gets out of the plane and starts paddling the boat toward the island - there is no island in the background. He is paddling out to sea.
When escorting an unwilling passenger onto an aeroplane no professional would take the window seat and allow his subject open access to the aisle as Henriques did.
Matrix loudly knocks a guy out on a plane without anyone batting an eye, including the resting passengers in front of him. Something similar happens in the beginning when Lawson is gunned down by the men impersonating garbage collectors: They don't use silencers and nobody hears the gunfire.
During the fight with Cooke in the motel, Matrix mocks the fighting abilities of the Green Berets, which is the nickname of the U.S. Army's Special Forces. Everything in the film indicates Matrix himself is a former Green Beret, including wearing an Army Special Forces belt buckle.
Matrix is taught to be super stealthy and has deadly instincts like being able to smell his enemy downwind, so it doesn't make sense that he would rip the seat out of Cindy's car, causing a lot of noise and making Cindy gasp in shock, when he's trying not to draw Sully's attention that he got off the plane. Surely it would've made more sense to just keep Cindy quiet and recline the seat far enough to disappear from view, or hide in the back seat instead.
Matrix and Cindy raid the sporting good stores they cart off a loaded and functional M202 rocket launcher. A weapons dealer would never keep their weapons loaded and on display where anyone can grab them. That's a good way to lose you license.
After Bennet's reply to Matrix's vow that "he'll be back," he drives away, and the boom operator (and his microphone) are reflected in the rear passenger-side window of the car.
Matrix, a former Army Special Forces commando, secures his grenades to his tactical vest by tying the pins to a metal loop on the vest. No soldier with even a minimum of combat training with ever do this, due the hazard of the pin being accidentally pulled out, and killing yourself.
The airstairs at Val Verde Airport say "Aire Servicio", which is an incoherent, word-for-word translation of "Air Service" into Spanish. (Translated back into English, it would mean something like "Service. Skies.") The correct translation would have been "Servicio aéreo".
When Matrix is surprised by the barking dog in the cage on the airliner, the dog keeps barking at something else and pays no attention to Matrix as he moves away from the dog's cage.
The police are marching Matrix out of the gun shop, they didn't even put hand-cuffs on him! I think I would put hand-cuffs on a guy who just smashed open a gun shop and was stealing all the guns he could get into his hands.
At 52:05 John Matrix looks at the coordinates which are N33°13' W119°18' and says "these coordinates are somewhere near Santa Barbara. Those coordinates are nowhere near Santa Barbara, they're at San Nicholas Island, 87 miles (140Km) off its coast. However, when he finds them on the map, he points right to San Nicholas island.