Immediately after takeoff the pilot says that he needs to return and land because the landing gear of the Gulfstream fails to retract (stuck in the down position) after the car explodes beneath. However during the ensuing fight scene between Frank and Gianni each time you see the outside of the Gulfstream (as it spins out of control) the landing gear is clearly up.
All through the movie, Gianni Chellini's name is mispronounced. He is obviously Italian, and so his surname would be pronounced "Kellini". It is instead pronounced as it would be in English; "Chelini".
When searching a police computer Tarconi claims to be not PC literate due to the fact that in France there is only one PC for every ten policemen, yet he already has a PC in his office, surely for his own private use. He then proceeds to touch-type which would take someone of exceptional IT skills and great levels of dexterity due to the fact that American and French PC keyboards have a different key layout.
During the Bus/Water chase scene the Russian can be seen on the back of the bus. After the shot of the Jet-Ski going under the bridge, you can see the Jet-Ski and the bus in the same shot. The Russian is not on the back of the bus. The next shot has the Russian back and hanging on the back of the bus.
When Frank crashes through the gate at Gianni's in the cab, the Jamaican cab driver is in the front passenger seat. In the next shot the passenger seat is empty when Frank looks at the security camera as he drives by, but when the cab pulls up in front of the house the Jamaican cab driver is back in the front passenger seat again.
During initial chase scene with Lola and Jack in the car, there are a few close-ups of the dash including speedo and tach; first close-up shows the vehicle accelerating from 105 to 120 MPH in city streets, while the next shot shows speedo starting at around 20 MPH (speedometer is partly obscured in second shot). In both shots, the dash clock shows time of 4:54 and it looks like the same shot sequence based on camera angle/movement, just edited into the scene in a slightly different order than it was shot.
When "Lola" (the lingerie-clad assassin) forces her way into Frank's car and makes him drive at gunpoint, her heavy black eye make-up is smeared under her eyes. Throughout the scene it changes from being a very wide smudge to just being a little smudged under her eyes.
When Frank comes out of the driveway after Lola (female assassin) gets in the car, we see security guards coming down the street in a Chevrolet Caprice. The tires blow after being shot, causing it to crash in to the cop car Lola drove, at this point the security car is now a Ford Crown Victoria
When the A8 is spinning and sliding sideways through the garage, it is knocking down metal support poles. When the vehicle comes to a stop, there is absolutely no damage done to the vehicle from the impacts with the poles.
During the fight with the fire hose, Frank throws the hose at the guy going up the stairs and you can see the hose wrap once around the escaping bad guys right ankle. When Frank pulls on the hose and drags the villain down the stairs, the hose now has a knot in it to keep the hose wrapped on his leg. When the villain gets to the bottom of the steps, the knot is gone and the hose is once again just wrapped once around his leg.
When the Captain slumps forward on the control yoke, he rolls the control wheel to the right. This would cause the aircraft to roll to the right. In the subsequent outside shot, the aircraft is shown rolling to the left, not to the right.
In the doctors office we see Lola's tattoo on her inner thigh and the words "Death by Rabbit" are above and below the rabbit, with no banners. The next time we see the tattoo is when she is getting out of the police car in front of the house and the words are now in banners.
When Frank jumps the jet ski onto the road, a midair shot shows the jet ski headed onto a 4-lane bridge directly in between the bus and a brown Toyota Camry, both in the right lane. In a subsequent shot, the bus is in the left lane on a city street and there are 2 cars between it and the jet ski. In the next shot, the Camry is not behind the jet ski, and in the shot after that, there are no other cars and the bus and jet ski are on a 2-lane bridge.
In a "warehouse/laboratory" scene, the exit sign at the stairwell is the small, green, illuminated European style sign with a pictograph, not a U.S. standard eight inch or greater letter height, "EXIT" sign.
In the early seen where Frank is driving Jack home for the first time after school: As Frank is pulling into Jack's home driveway, the specific and highly recognizable "W12" logo has disappeared from the Audi grille.
When Gianni is discussing the ransom, Lola is behind Frank with her hand on his shoulder. Then the camera cuts to a shot of Frank from the front, and Lola is not there. Afterwards, they cut back behind Frank, and Lola once again has her hand on his shoulder.
During the fight scene at start, when the transporter gets back into the car after the fight is over, he wears the gloves once again. During that the shot taken from front has the side window half open, while from side view the window appears closed.
When the gas is ignited from the cylinder in the doctor's office, the cylinder goes shooting down the hall. You can see that the valve is still intact. In reality, the gas escaping from the cylinder through a valve which is at a ninety degree angle to the cylinder such as the one shown, would force the bottle to spin, not to shoot out and fly in a straight line. Additionally, if the pressure of the gas were enough to move the cylinder, it would do so regardless of the gas being lit on fire. The burning, and subsequently expanding, gas would have no effect on the cylinder once it is outside of the valve as the burning gas does not increase the force on the cylinder.
In the scene where Frank is fighting Gianni's men in the doctor's office, Lola fires continuously without reloading until she gets outside. The type of machine pistols she uses usually only have 30 rounds per clip or less. However, she fires much more than 30 rounds from each weapon without reloading.
Tipoff's gun is a Hk USP-Match (modified) which is composed of a USP and a weight or compensator (black colored) called 'Match'. This weight is screwed to the gun in front of the stainless (silver colored) slide. So it should be impossible for Frank to remove this slide (while fighting and) without unscrewing the Match blocking it.
The movements of the aircraft after the pilot is shot. In turbine powered corporate aircraft (jet engines are turbines) the aircraft is designed not to stall (losing lift on the wing). Therefore the scene with the plane going straight up, then stopping, and coming (roughly) straight down would not have happened as the automation systems within the plane would prohibit it, pitching the aircraft down well before it even reached that point. The spin the aircraft enters is also impossible for the same reason. An aircraft has to be stalled to spin. The only way the spin would have been possible is with one engine out, if they were on the outer edges of the wings (which they were not).
When Frank opens the door to pull Gianni out of the airplane underwater, you can see that the surface of the water outside is about 2 feet above the door. However, once they're out, Frank has to swim up 60-100 feet to reach the same surface.
When Frank chases the airplane that is taking off the jet engines clearly have thrust reversers engaged. Those are normally used to slow down the aircraft after landing and would cause the plane to crash if engaged on take-off.
When Frank is walking in the room full of isolation tents for the various test victims of the virus, the tents obviously have positive pressure inside. If one were trying to isolate an airborne contagion inside, positive pressure would not be used; positive pressure is used to keep contagions out, not in.
When the Jamaican taxi driver hides in the yellow convertible during the fighting scene in the garage, you can clearly identify it as a Porsche 911 Turbo Convertible. However, when he meets his friends at the end and shows his brand new Porsche taxi, it is a normal 911 convertible (different bumper, headlights and rear) with the turbo rear wing.
During the opening scene showing Frank's Audi A8 we can see the W12 badge on the grille of the car. The W12 A8 has characteristic quadrilateral exhausts, but when we see the back of the car it features standard round exhausts of a regular A8.
The pipe used to beat up the thugs in the garage is supposed to be metal, judging by the "clang" noise and sparks when it hits other objects. The pipe flexes badly when it strikes anything else and is obviously made of rubber.
After Jefferson leaves the conference, he starts coughing and hands his glass of champagne to a woman at his side. The woman starts screaming a little too early; more than 2 full seconds before Jefferson collapses to the ground.
Although the aircraft hits the water at a high rate of speed and the windshield apparently shatters, there is no damage shown to the forward portion of the aircraft in the subsequent scene as the aircraft is sinking. With the volume of water that rushes into the cabin, the aircraft would certainly have to have substantial damage to it, and in reality would be crushed in the front as it is only made from aluminum.
When Frank gets the first container containing the antidote it clearly contains more of the substance than he injects the boy with. So they would be more than enough to at least cure Jack's Mum and himself.