Ryan's last name is "Kowalska". This is a Polish surname, however, the
"-ska" ending is incorrect and is traditionally used by a daughter. Ryan's last name should actually be "Kowalski", since he's a boy.
While the 2 detectives are interviewing Jade for the first time, the camera pans past a computer monitor that's clearly not plugged into anything.
Ryan refuses to believe without proof that DI Bascombe lost a tooth as child as he claimed. However, as the DI said that he was around nine years old when this happened, it could have been one of his milk teeth.