Revealing mistake: Throughout season 2 on several occasions it's clear that John Terry (Bob Warner) is wearing a fake mustache and a fake beard.
Day 3: 11:00 A.M.-12:00 P.M. - S3-E23
Revealing mistake: When Sherry is shot, the impact is visible on her shirt, but no gunshot wounds can be seen on her skin underneath, which can be seen as she falls to the ground.
Day 6: 9:00 AM - 10:00 AM - S6-E4
Revealing mistake: When Jack is forced to kill Curtis, Roger Cross flinches before the sound of the gunshot. (00:36:35)
Day 7: 4:00 PM - 5:00 PM - S7-E9
Revealing mistake: When Renee says she couldn't get the laptop to boot up due to a fried hard drive, the Windows desktop is visible on it, which meant that the laptop did boot up.
Day 2: 7:00 P.M.-8:00 P.M. - S2-E12
Revealing mistake: When Kate Warner phones her sister, Marie holds her phone up to the camera and you can see that the words "KATE'S CELL" have been written using the 'Write Messages' function on her Nokia. The 'abc' in the corner gives it away plus you can see the cursor trying to be hidden by being moved next to the 'K' (00:20:05)
Day 2: 6:00 A.M.-7:00 A.M. - S2-E23
Revealing mistake: After Kate Warner has picked up Kim Bauer, they are drving back to CTU in Kate's car. Unless I'm mistaken, when the car is shown, there is no number plate.
Day 3: 8:00 P.M.-9:00 P.M. - S3-E8
Revealing mistake: Right when Jack and the prisoner are walking through what appears to be the gun room in the prison, you can see the guy who attacks them through the door. You can only see a small part of him but he is obviously waiting to enter the scene and attack. (00:14:00)
Day 2: 5:00 P.M.-6:00 P.M. - S2-E10
Revealing mistake: Kate Warner holds a bloody towel to her wounded earlobe. She puts it away and you can see a very clean band aid around the lobe. (00:27:55)
Day 2: 5:00 P.M.-6:00 P.M. - S2-E10
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)
Day 2: 6:00 A.M.-7:00 A.M. - S2-E23
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.
Day 7: 2:00 PM - 3:00 PM - S7-E7
Revealing mistake: Samantha Roth's dead body is obviously played by a body double.
Day 7: 5:00 PM - 6:00 PM - S7-E10
Revealing mistake: Chloe says that the drive containing all of Dubaku's corrupt U.S. contacts is a PX-17 drive, but in the closeup of the drive, it reads "PX-3". (00:22:15)
Day 2: 12:00 Noon-1:00 P.M. - S2-E5
Revealing mistake: The Fox news video that Palmer watches of the Ambassador's helicopter being shot down is marked 1:18:24 in the lower right hand corner. The episode is supposed to take place between Noon and 1 p.m. This is 41.47 into the episode.
Revealing mistake: Bad guy is shot but can be seen breathing afterwards on the ground. At the start of the next episode, he was shown to be shot in the head. (00:40:38)
Revealing mistake: When Teri is driving from the hitman, she drives down the dirt covered side of the road. There are tire tracks visible in the dirt from previous takes. (00:31:40)
Revealing mistake: When Dan is shot at the end, you can see protective equipment under his shirt as he falls back. (00:40:40)
Revealing mistake: Tony Almeida tries to phone with a telephone, which is not switched on. You see that the screen isn't displaying any information. (00:25:10)
Day 8: 4:00 P.M. - 5:00 P.M. - S8-E1
Revealing mistake: When Farhad Hassan brings the press ID for Meredith Reed to security, you see the guard walk through the metal detector wearing his police belt, but the metal detector does not go off, showing that it's either not real, or not turned on.
Day 4: 12:00 P.M.-1:00 P.M. - S4-E6
Revealing mistake: During the rescue, a few shots after SecDef Heller announces to Jack that he's also out of ammo, you see a shot of the bullet-riddled car taking a few more bullets. The new bullet holes obviously fade in.
