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Continuity
After Meredith sees Derek outside of her mother's hospital room, she goes to talk to him while he's putting some files away, when he turns around his hands are empty, the camera pans to Meredith and when it pans back to Derek, he now has a bottle of water in his hands.
Dr Bailey is in the operating room holding Cristina's head. She comes to the door to talk to Meredith, and while she is talking, looks back to the operating table where Cristina is lying. Bailey's hands are visible in the close-up of Cristina's face even though Bailey is now standing at the door.
When Derek and Richard are in the lift talking, you can see Richard's head bandages under his hat. But when he removes his hat, his head is bare.
In the elevator, Dr. Webber has visible gauze under his hat in a few shots. However, when he leaves the elevator, he removes his hat and there is no gauze.
When Addison and Derek are in the room with the premature baby addicted to narcotics, Addison is listing options for her and Derek's relationship. The chair that Derek is sitting on has a blanket draped over it and it changes position throughout the scene many times.
After Meredith sees Derek outside of her mother's hospital room, she goes to talk to him while he's putting some files away, when he turns around his hands are empty, the camera pans to Meredith and when it pans back to Derek, he now has a bottle of water in his hands.
At the beginning of the episode Dr Webber is speaking to Dr Shepherd in the lift. The bandages from his surgery are clearly visible under his hat. However when he is speaking to Dr Shepherd from outside the lift without his hat on, the bandages have disappeared.
In the elevator, Dr. Richard Webber wearing a hat underneath where you can see the bandage. In the next scene bandage under his hat was gone.
The surgery board has a circled 'R' indicating the removal of the right fallopian tube and ovary. In the next scene Bailey explains to Yang they had to remove her left fallopian tube and ovary.
After George talks to Dr. Burke about a biopsy, the camera shows Cristina's procedure on the board and we see the term "salpingo-oopherectomy", which would be spelled "salpingo-oophorectomy" - the surgical removal of a fallopian tube and an ovary.