As ER ends its fifteen year run, viewers are treated to many treats that make the series finale so grand. One of the most notable similarities between the ending and the beginning of the series is that there is a scene in which Lydia waking up Dr. Archie Morris in the same manner that she woke up Dr. Mark Greene fifteen years ago.
The newest med student also has a Carter-like moment where she doubts she can be a doctor after watching a patient die. In this scene, Dr. Simon Brenner takes the persona of Dr. Mark Greene and tells the med student that the reason they do this job is to help as many people as they can, even if they cannot save everybody.
By far the best moment of the entire episode (other than seeing Sherry Stringfield reprise her role as Dr. Susan Lewis one last time) is when the prospective med student who seems navigationaly-challenged turns out to be Rachel Greene.
All in all this was a fitting farewell to such an awesome television series and a groundbreaking medical drama.