Corrected entry: As Cuddy is making the deal with House, how much time off from Clinic duty for a week off his vicodin, while the camera is behind Cuddy you can see there is bright sunshine on House's head. The shot switches to a camera behind House and now his head is shaded.
Corrected entry: The doctors tell House that blood tests did not show anything wrong with the teenage boy, but near the end of the episode, he realises that it is naphthalene poisoning. Naphthalene poisoning is something that is easily noticed by doctors through blood tests.
Correction: Naphthalene is fat soluble. It was only released in his bloodstream when he started losing weight in the hospital.
He didn't start losing weight while he was in the hospital. He started losing weight before he was in hospital. And the naphthalene would have been released into his bloodstream before he was in the hospital.
Did he start losing weight before or after the blood tests?
Correction: The light is still visible in the shots from behind House, just not as easy to see.