Plot hole: Inmediately after Jamie Foxx finds the bomb in the city hall, and he says, "We don't tell the mayor anything", we see Gerard Butler arriving to his property next to the prison, and finally he enters his jail cell. So, in the time between Gerard Butler's arrival to the property and his entrance to the jail cell, Jamie Foxx thought about a plan, picked up the bomb, passed through the traffic and security checkpoints, talked to the warden to get access to the prison, entered solitary, handcuffed the bomb, and still had time to wait for Gerard Butler's arrival.
Plot hole: When Clyde leaves the building that he has planted the bomb to kill the Mayor and the rest of her party, he goes to his van, watches a TV feed of the meeting, then puts the van into gear and moves off. Only problem is, he didn't actually switch on the ignition, and no, Clyde didn't leave the van left switched on either, he's meticulously planned the whole operation, and isn't likely to chance his one means of escape by allowing it to be so easily stolen, and any suggestion that he'd be able to leave the van running with 'conspicuous police security' is a nonsense, as that would draw more attention to the van, something Clyde SPECIFICALLY would not want.
Continuity mistake: When Nick and Clyde are talking outside the prison fence, Clyde's mouth is bleeding after Nick hit him. In the next clip there is no trace of blood. Even if he has tried to wipe his mouth with his hand (which we don't see) there would be some blood visible.
Add timeJacob La Cour
Factual error: The co-ordinates given by Clyde Shelton: 39° 57' 4"N 75° 10' 22W as the place to find Mr. Reynolds, is the corner of 19th and Sansom Street in Center City (1919 Sansom, to be exact, which is an apartment complex), the downtown area of Philadelphia. The scene actually takes place underneath of the Betsy Ross Bridge, about 8 miles northeast of the coordinates.
Plot hole: Clyde enters his cell in the final scene, and is surprised to find that he has been found out. His secret tunnel, if we go according to the characteristics accredited to his character throughout the movie, is surprisingly without any alarms of any sort. Very strange if we are to believe he is as deadly as credited. He ends dying a very silly death.
Continuity mistake: When Darby is running from the police and heading for the police car you can see the exhaust emitting from the police cruiser tail pipe. When he gets in the car he says start the car and you can see Clyde turn the ignition/keys and the engine starts of an already idling vehicle.
Audio problem: As Shelton is about to drive away from City Hall, we see him operate a lever on the steering column of the van and we hear the familiar sounds of a transmission shifter clunking through a few settings into "Drive". The problem is that he used the lever on the left side of the column, which is the turn signal lever. The transmission shift lever is on the right side of the column. In reality, Butler used his left turn signal before steering left into the travel lane, and the sound editors added the shifter sound to try and cover the fact he's never actually seen putting the van into gear in the scene.
Character mistake: From prison in the interrogation cell Clyde asks for his steak "medium." In the scene inside Clyde's cell, when the waiter delivers the steak to him, the waiter calls out the steak order as "medium rare."