Continuity mistake: When Roy Nord is about to go into the mid river passage, a girl is taping him on her digital camcorder. In the first shot her hand is gripping the camcorder's screen and bottom with one finger next to the LCD display, but in the following shot all of her fingers are at the bottom of the camcorder. (00:37:00)
Continuity mistake: When Kit rushes to a table and scrambles everything off it to pick up a large object to stop the fan, the timer in the background says 28 seconds. But when Kit walks up to the big fan to slow it down we see the timer again and it says 19 seconds, but only two or three seconds have passed since we last saw the timer so it should be at about 24 or 25. (00:39:40)
Factual error: Even if the survivors were in their vehicles, a raging inferno like that would seriously damage their skin. Even if a vehicle can protect you from being set on fire, I think the chances of being skin burned and blistered are especially high. First of all, the prison bus had those open diamond holes on the side of the bus. Also, I believe someone's car window was open, so they should have been set on fire.
Continuity mistake: When the tunnel caves in as a result of the explosion, the cars about to enter it come to a stop in almost a straight line. When Stallone gets out of his limo, the cars are now scattered everywhere. Then, when he goes back later to the collapsed entrance, the cars are not only in different positions, but some have changed in make and model as well.
Other mistake: When the thieves are "escaping" in the tunnel, there is enough space for them to drive fast and cut in and out between other vehicles. This would be impossible because traffic was jammed in and out of the tunnel.