Other mistake: In the shootout at the stadium, several times when Jack fires a gun the sound of the gun firing is heard but it is obvious that the gun did NOT fire. Most noticeable when Jack fires the third shot at the man behind the wall and when he is struggling for the gun with the last guy who he beats up.
Deliberate mistake: The blue and white airplane when the male terrorist tries to take off has the following registration: N34G5 This seems to be a deliberate mistake as only the following N registrations are officially possible: N plus one to five numbers (N12345) / N plus one to four numbers and one suffix letter (N1234Z) / N plus one to three numbers and two suffix letters (N123AZ).
Revealing mistake: Right after Kim Bauer and Miguel start a fire in the police van, the vehicle swerves off the road and tumbles. In the next shot, you see "Kim" on top of the car, trying to get in through the window (the car is about to fall off a slope or something). Pay close attention, zoom in, or whatever, the woman is not Kim but is a stunt double. She's got a much chubbier-looking face and is definitely not Kim Bauer. This occurs at 19:40 in this episode. (00:19:40)
Factual error: At 18:50, Tony tells Jack that he's contacted someone at the San Jose Sheriff's Department. At 19:35 Jack calls and gets a response of "Sheriff's Department" on the line. There is no San Jose Sheriff's Department. It should have either been the San Jose Police Department or the Santa Clara County Sheriff's Office. (00:18:50)
Continuity mistake: When Roger Stanton is about to be arrested, just before he stands up from his desk, we can see that the screen of his laptop is completely blue, however, while he is walking away with the army men, we can see the red ACCESS DENIED message on the screen on top of the blue background. No one touched the computer during that time.
Revealing mistake: When Michelle is in the van, waiting for the computer to finish analysing the conversation between Alex Hewitt and Sherry Palmer, the computer bleeps to says it has "heard" enough of the conversation to be able to recreate Hewitt's voice. How ever, it bleeps whilst Sherry is in the middle of talking. The computer should have made the noise about 15 seconds before.