It is finally revealed (11-14: Just As I Am) that Dr. Weaver uses the crutch because of congenital hip dysplasia.
The character of Haleh was supposed to appear in this episode but was written out, and with good reason. This episode picks up right where the previous season's finale left off, but the actress who plays Haleh had lost over 100 pounds over the summer hiatus.
The first four episodes of the show all began the same way - with one of the doctors being awakened early in the morning from 'Exam 8' at the end of the hallway, in this order: Greene (Pilot), Lewis (Day One), Benton (Going Home), Carter (Hit and Run). Ross (George Clooney) was the only one of the original five who never slept in Exam 8.