Revealing mistake: When Matrix sends Sully to his death by dropping him off the edge of the cliff, in the shot of Sully falling it is an obvious dummy.
Continuity mistake: During the motel room fight scene when Cooke crashes into the other room, the door separating the rooms changes between shots. When he first crashes through the door it's just a wooden door with a large brass knob, but when he lands on the floor in the other room the door is now surrounded by a white frame and the knob is visibly smaller.
Continuity mistake: After killing Henriques on the plane, Matrix asks the flight attendant how long the flight to Val Verdes is. When he asks her the question, her hand is on the curtain separating first class from economy, but in the next shot her arm is by her side when she answer's Matrix's question.
Continuity mistake: In the dealership, Cooke never shifts the Cadillac into reverse, and yet instantly starts backing up after he says he likes "the price." The car would have had to be in Park or Neutral in order to be cranked up and would not start in gear.
Continuity mistake: In the final fight scene Bennett opens a furnace door into John's face, knocking him to the ground. When he opened the door it was two half-doors that opened together, yet in the next shot when he rips the door off to throw at John, only the bottom half is still there.
Audio problem: When Cooke starts up the Cadillac in the dealership you hear the engine turn over and fire twice.
Audio problem: 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.
Continuity mistake: After Matrix's daughter puts ice cream on him, the ice cream on both him and her's changes from higher and lower positions between shots.
Continuity mistake: During the initial credits, the amount of ice cream on Matrix's nose and lip decreases between frames.
Revealing mistake: During the airport scene involving the thug, Cindy and Matrix, the same extras are seen walking around the place over and over again.
Continuity mistake: Right when the fight between Matrix and Bennett begins, the Uzi submachine gun vanishes from Bennett's right shoulder (it was on a strap). Then suddenly at the end of the fight (after the fell down over the railing and to the next level down, the Uzi reappears when Bennett picks it up and attempts to shoot Matrix. Bennett lost it on the upper level nowhere near the railing, and it somehow appeared on the lower level away from the railing.
Factual error: When Matrix escapes from the landing gear of the plane, he opens a hatch to access it, but doesn't close it behind him. This would have later led to the cabin depressurizing and the plane plummeting to the ground.
Suggested correction: No, it wouldn't. The entire wheel well of an airliner is pressurised - otherwise the tyres would explode! Once the undercarriage is retracted (typically at less than 1000 feet) the pressurisation problem no longer applies. Plus, the access door opens inward (like most aircraft doors), so the pressurization would force the door shut against the frame anyway.
Wheel wells of airplanes are not pressurized. Airplane tyres are about 145PSI at ground level, and at altitude they'd be under 160PSI, nothing radical for tyre manufacture. Plus as the air temperature decreases at higher altitudes, the tyre cools and the internal pressure drops, more than compensating for the lower external pressure.
Wheel wells of airliners are always pressurised. Those stowaways who hide in the wheel wells die from hypothermia or are crushed to death by the retracting undercarriage. They do not suffocate.