Known among many "ER" fans as "The Breakfast Club Episode" due to its similarity to the 1985 John Hughes movie.
This is what's known as a bottle episode - where the action is confined mostly to just one room with a limited set of characters. Here, doctors Kovac, Carter and Lewis, nurse Abby Lockhart and med student Gallant are holed up in a lecture room, waiting for a Human Resources member to come give them a lecture on sexual harassment. Bottle episodes are usually designed to cut costs for a cheaper episode.
Luka says that he plays Hamlet in his native Croatia every year. This is certainly true of actor Goran Visnjic.
Fame (1980) is referenced in this episode, specifically the song "I Sing The Body Electric". In the movie, the song was sung by among others, Paul McCrane who is also on the show.
When talking about Carter's wealth, Gallant asks how rich Carter was. Lewis replies, "Think Bill Gates!" Noah Wyle played Steve Jobs - an old time friend and rival of Bill Gates in the tv movie Pirates of Silicon Valley (1999). Anthony Michael Hall played Bill Gates in the same movie and was one of the main cast of The Breakfast Club (1985) - the movie that this episode resembles.