Noelle's character when talking with Bryan on the Desert floor, has her wristwatch move several times from the top of her wrist to the bottom of her wrist.
The characters magnetize a razor blade by rubbing it with silk; this is impossible. You can generate an electrical charge by rubbing an insulator with silk; but to magnetize a piece of steel or iron, you need to stroke it with a magnet.
The night after the crash Noelle's wristwatch clearly reads 4:03. It's possible the watch was damaged and reset in the crash, or that the watch is showing a different time zone (some watches will let you switch to another time zone with the push of a button). It's also possible that the time was 4:03am, since it wasn't made clear how much time had passed since the previous scene.