Other mistake: During the explosion from the tape recorder, there is a very short explosion shot recycled from a previous season (when Christopher locks Jack in a bunker and tries to kill him with a bomb placed in a clipboard). This old footage is also seen when that tape recorder explosion is shown on recaps of the event in season 6.
Day 6: 7:00 AM - 8:00 AM - S6-E2
Other mistake: At 7:45 Ahmed leads Scott out of his house at gunpoint so he can go to Scott's house. At 8:14 they arrive. But Scott's house is just across the street so we're supposed to believe that it takes half an hour to cross the street.
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.