I also thought the "Lex" comment was odd, but I do think it was purposeful. Meredith is obviously 'caving' a little, she even told Derek she wanted to 'stay a little longer' instead of running home like she usually does. I think it'll be too little too late with Derek, but not with Lexie.
I actually prefer Lexie to Meredith right now, though she is like a clone! I feel badly for her and I do think her father's alcoholism will bring her and Meredith closer, and I think that she will fall in love with Alex.
My predictions: Something will start back up with Alex and Izzy, Sloane and Cristina will become closer and Dr. Hahn and the Chief will start to flirt! Call me crazy!
What's this about a new love interest for Derek? I'm intrigued, I can't stand his relationship with Meredith anymore!!!
Also, I loved the scene where Bailey was crying and hugging the Chief. She deserved the job, she deserved the sappy scene too! Even Bailey has her weak moments!
Overall I really liked this episode, but I still feel like we need more characters to 'play with.'