Revealing mistake: When Alex is talking to Rebecca Pope at the end of the episode, we hear Alex say "Now I know more about you than my friends." Watch Rebecca's left eye on the right if the screen when she says, "That's pathetic." Someone did a bad job of editing the CGI and we see a phantom eye over her left eyebrow.
Grey's Anatomy (2005)
1 revealing mistake in season 3 - chronological order
Continuity mistake: 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. (00:03:20)
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.