Other mistake: When Alice pushes in the new magazine, she doesn't pull back on the slide, meaning the gun doesn't have a new bullet in the chamber, thus is unable to shoot.
Other mistake: Alice and Ada blow up the NY Taxi in a huge fireball but don't get effected by the fireball despite being only 3-4 foot away from it. (00:36:40)
Other mistake: When Jill orders a sweep of the corridor with the laser grid, the lasers almost catch Alice, and the camera changes and the grid is much further back giving her time to escape into Tokyo. (00:18:00)
Chosen answer: Jill was unconscious at the time, while Claire was awake, therefore the loss of memory may differ by state of mind, or vary from person to person.