When Izzie has to open Mr. Harper's sternotomy bedside, they show her for a split second on the left side of the bed wearing a yellow gown, then they show her on the right side of the bed wearing her scrubs and lab coat.
In the scene when the patient with the large tumor is crashing in the OR, one of the men who is part of the surgical team also plays "Joe the Bartender" later on. He says the the line "pressures dropping".