Factual error: When Janet enters the operating theatre, the surgeons put some x-rays on the light box. The x-rays are from a barium enema, which would have no relevance to Janet's injuries.
Factual error: While Drazen is a very common Serbian given name, it is not found as a surname in that form. The surname "Drazenovic" would be fairly common, but not simply "Drazen". Even then, it would be pronounced "Drah-zhen" and not "Dray-zen" as everybody in the show does.
Factual error: Janet would have been in surgery for several hours, instead of just 40 minutes or so.
Factual error: At some point Jack tries to get a message to CTU about the fact that he is being held hostage. The enemy sees Jack writing and tells Jack to shred the message. I work in government security. Believe me, no government agency would have a simple shredder that just cuts the paper into strips. Required is a cross cut shredder that breaks the paper into almost a pulverized state.
Factual error: At about 5:45pm, Teddy is viewing Jack through his rifle scope, but there are no cross hairs, nor any other reticles. (00:31:20)
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.