Continuity: When Denzel Washington is taking off his clothes to be sent back in time. We see him take off his blue shirt. The shot then changes to look at the other guy and we see him take off his shirt again.

Audio problem: When Doug is staring at the terrorist and says, "I can see him, he's right in front of me", you'll notice that his mouth moves a little before words are actually said. This is because he first says "Jesus", but they took it out because the character playing the terrorist is Jim Caviziel, who played Jesus in Passion of the Christ. The filmmakers did not want to get a laugh out of that line which it inevitably did in test screenings.

Continuity: During Claire's post mortem, Doug takes a picture of her face. Her head was tilted towards the camera as were her eyes. When the picture comes out, it shows that she was faced away from the camera.

Continuity: When Carlin goes to the dock he gets out of the Hummer carrying a gun. The gun changes hands between shots as he is walking.

Plot hole: The bad guy soaks the woman with fuel. The bad guy then shoots Denzel, and runs outside. He then fires at a propane tank that causes the entire building to explode. The fireball is enormous, and flaming debris is everywhere, including being inches from the woman. But she never ignites.

Revealing: When the truck leaps off the ferry, the underside is seen, exposing the still-flaming 'roll cannon' opening in the rear floorboard. This cannon is what caused the rear of the truck to rise, sending the truck flipping through the air.