Cristina Yang's blood type is AB+.
Every episode of the show is named after a famous song. "Make Me Lose Control" is a song by Eric Carmen.
When Bailey enters the locker room to talk to Meredith about her emotional state she locks the door. When Meredith leaves the door is unlocked.
When Cristina and Meredith are jogging, Meredith's headphones are not connected to her iPod. Although she isn't wearing the earbuds in her ears, they are clearly not even attached.
George says "Make the lambs stop screaming", referencing Clarice Starling's dialogue in the "Silence Of The Lambs", Brooke Smith who played Catherine Martin in the movie would later join the cast in the same season as Dr. Erica Hahn.