I liked this episode. This time was really hard for Christina to deal with her daughter's problems, Isabelle's little Moses and a hundreds of patients at the ER.
I loved the final dialogue among Christina, Tom and the big chief: you can see that friendship between Tom and Christina is more important than job, for them.
And of course this one is priceless: "When did you two have sex?" (Bobbie).
The revelation about Ryan's father was a bit shocking, but I must admit I was waiting for something like that. And I think Christina did the right thing at the end, even if that man deserved a lesson.
And the thing about the crazy patient talking with Ray was already seen: there's an episode in E.R. where a man pretend to be a doctor who's making a study about relatioships in hospitals and at the end we find out that he's only a crazy patient escaped...