When we first see Jack's Jeep as he's driving Casey home, it has a license plate on the front. But as they pass through the gate, the license plate is missing.
When Cinder is alone with her assailant, photographed from the back, her hands are clearly tied around a post, but photographed from the front, they are clearly free.
In the first shootout, Jack saw the flash grenade tossed, shielded the girl and jumped away from it. That savvy, experienced character certainly would have known NOT to open his eyes too soon, saving him from the resulting impairment.