We Are Never Ever Getting Back Together - S10-E22
Other mistake: When Meredith is talking to Kenzie about the conjoined twins, she is wearing a lab coat that says Seattle Grace Mercy West. The hospital is named Grey Sloan Memorial at this point. (00:20:00 - 00:21:00)
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.