Continuity mistake: When Mosely is first transporting Eddie in his car and stops to buy a bottle of alcohol. The first hit is attempted on Eddie but as Mosely exits the store he shoots the hitman from behind. Watch closely as the camera does it's 360 around Mosely. His gun, a Glock, is jammed. It appears to have either a shell stuck in the chamber or it's just a mistake by the props department, they forgot to close it completely. Glocks fire from a closed chamber, then they eject the shell, load another and close the chamber again, in a single movement. It should be closed after he has fired the shot. When the camera comes back to Mosely after a slow look around the street, he is being fired upon by a second hitman. The gun chamber is now closed and ready to fire again.
Revealing mistake: When Jack drives the bus down the alley, it knocks a series of A/C units off a building. The last one comes open and there is obviously nothing inside.
Continuity mistake: The birthday candles on the cake from Eddie change colors between shots. In some shots they are all red, white, and blue, and in other shots there are other colors in the mix as well.
Other mistake: When Bruce and Mos Def are running through the alley near the beginning, they run past a Chinese man who slams a dumpster lid shut. Once Bruce pulls out his gun to look back, that same man starts running because he gets scared. In the next shot, he continues running, but soon stops as if he thinks filming is over. This is visible right before the camera pans to the right.
Continuity mistake: Near the end of the movie, Jack's sister receives the cake from a delivery man. When we see her take the box, it's a clean brown box with Up arrows printed on it. A few seconds later, we see her cutting it open thrown a whole lot of "Fragile Handle with care" tape around the box, and hand written instructions in red ink on the box.
Continuity mistake: After Eddie gets back on the bus, and Jack smashes through parked police cars down the alley, you see that the tyres which had previously been shot out and had come loose have returned and are fully inflated.
Revealing mistake: After the hostages are released and Eddie runs back to the bus, Jack opens the front doors to let him back on. Before he touches the door handle, it is pointed all the way towards the back of the bus. With the handle in this position, both the front and rear doors of the bus would be open already.