Continuity mistake: When Meredith's talking to Lexie in the clinic, in one shot from Lexie's right there's a chunk of hair hanging in front of her ear. We cut to a shot from the other side, then back, and without her touching it, it's now neatly tucked back.
Grey's Anatomy (2005)
1 continuity mistake in season 4
Throwing It All Away - S10-E15
Factual error: In the opening scenes, Arizona mistakenly says a child suffering from imminent liver failure is at risk for psoriasis, when the script called for the word cirrhosis. Psoriasis is a skin disease. Cirrhosis is the medical term for end stage liver disease.
Katie Bryce: My head is full.
Dr. Meredith Grey: It's called thinking. Go with it.
Winning a Battle, Losing the War - S1-E3
Trivia: Several times in this episode, jokes are made about the residents thinking George is gay. Isaiah Washington was later fired for making homophobic remarks about T.R. Knight.