While the interns are in the locker room discussing Izzie's $8.7 million, the other interns in the background quickly disappear then reappear while Cristina is eating her apple.
Izzie's locker is in a different spot than other episodes. Namely, the episode with the plague quarantine Derek is seen finding a lot of food in a locker in the middle bank and George tells him it was Izzie's locker.