The bus scene where Helen tries to get off the bus, Jack comes up behind her and lays his hand on her shoulder. The camera then goes from the cops on the trailer to the bombers remote and back to Helen and no Jack. Where's Jack? Helen gets blown off the bus and then Jack comes back into the picture.
I was wondering this but realised that they filmed the same few seconds two or three times showing different people and what each person was doing. Keano actually touches her shoulder a split second before the bomb explodes but it seems like a lifetime.