Charles Salt drives a Secret Agent car that has a control panel on the dashboard with the letters B-N-O-J-S-X. These letters stand for the various secret agent things the car can do -- for example, pressing "N" makes the car fire tire-puncturing NAILS at a pursuing car, and pressing the "O" button sends OIL at a pursuing vehicle. However, the audience never finds out what the buttons "J" or "X" stand for, or do. This could be a plot hole error.