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 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.
Chosen answer: Nobody knew, not even the writers, until at least halfway through the season when they were writing the end. They wanted to keep all options open.
Nick N.