William Daniels portrays Dr. Craig Thomas. He is one of the physicians who give Cristina her board exam. In the 1980's, William Daniels portrayed Dr. Mark Craig in the hospital series, St. Elsewhere.
After Meredith throws up for the first time, Alex refers to her as Typhoid Mary. This is the second time this nickname has been used on the show. Nurse Olivia (Sarah Utterback) was previously called Typhoid Mary after she gave Alex syphilis.
After Zola accidentally hangs up on Meredith she hears a dial tone. Whenever a call ends with a cell phone they are unable to hear dial tones.