It's the End of the World (Part I) - S2-E17
Continuity mistake: At the beginning of the episode when Izzie is getting a wheelchair for Dr. Bailey, Bailey's water breaks and it goes all over George's shoes. But when she is hauled into the chair her jeans are completely dry.
It's the End of the World (Part I) - S2-E17
Continuity mistake: After Meredith puts her hand on the bomb, everyone stands up. It shows Christina and Burke standing up looking at her, But in the following wideshot Dr. Burke is suddenly crouched down again.