(As We Know It) (Part II) - S2-E18
Character mistake: Meredith states that she cannot remember the last time her and Derek kissed. Derek says that the last time was when they were still dating, but it was actually at the end of season two episode three, after Addison arrived in Seattle and Derek and Meredith had stopped seeing each other. (00:40:00)
Suggested correction: She is referring to the last time they kissed without any issues. The last time they were good.
Continuity mistake: When everyone rushes Christina out of the OR after she collapses, Izzy suddenly loses her blue scrubs hat between shots, with no time to remove it herself. (00:23:50)
Suggested correction: She did have the time to change. And you can see in the end of the scene when Bailey is talking to her in the elevator and Izzie is outside, the mask and the hat in her hand.
