Continuity mistake: When Meredith is trying to give George the shot of Penicillin the gloves on her hands suddenly appear in one shot. (00:20:00)
Continuity mistake: Meredith takes over injecting George for Alex, and right after she stands behind George, Alex leaves. Just when he opens the door, suddenly you can see Alex is behind George and Meredith is just coming in again. (00:19:55 - 00:20:50)
Continuity mistake: When Addison introduces herself to Meredith, she reaches out to shake Meredith's hand twice.
Continuity mistake: When Addison shows up at the end of the episode, the umbrella she holds keeps changing position and swapping hands between shots. (00:42:05)
Continuity mistake: When everyone sits down for lunch, Izzy's bottle of water jumps from her tray to in her hand (as she drinks) between shots. (00:17:20)