Corrected entry: In the scene in the kitchen at Dave York's home, just before McCall arrives to confront Dave York, there is one child at the table with York, and the other sitting in the background at the bar. As the scenes cut, the child at the bar is there, then goes, then reappears as the scene plays out.
Corrected entry: Susan Plummer is in Denzel Washington's flat when he arrives home but there is no explanation as to how she got in.
Correction: Susan is a former DIA operative. The implication is that she used her skills to get into the apartment undetected.
Also of note is that McCall is aware that someone has broken in and reacts to it as if it is a threat, until he discovers it is Susan.
Correction: The girl didn't just appear and reappear she walked to the refrigerator and then came back and sat down.