If you look closely, the nurse played by Emma Thompson has a tattoo on her arm. It appears to be an angel, or at the very least some kind of bird. Thompson also plays the Angel of America in the series.
Among its seven Golden Globe nominations were mentions for all its principal cast members (a most unusual occurrence) with the sole exceptions of Justin Kirk and Emma Thompson. The reason for Kirk's omission was that he was originally put forward for a Supporting Actor nomination, until it was realized that he actually has more screen time than most of his co-stars. However, by switching to the Best Actor category, he was effectively canceled out as he lost the votes he had previously amassed in the supporting category.