Romano says to the nurse bringing him his food that the "prostetics department [can] come fit me for a hook." It's a nod to an upcoming episode in which Romano really does get a hook when his insurance won't cover a robotics arm.
Noah Wyle, now first in the credits, is the only member of the original cast that has been on the show since the very beginning. Sherry Stringfield was also part of the original cast, but she left the series in the Season 3 episode "Union Station." She returned in the Season 8 episode "Never Say Never," reprising her role of Dr. Susan Lewis after a five year absence.
Abby: Do you think it's possible to die from boredom? Chen: I don't think so. Abby: What if your mind wandered off in a daydream and you forgot to eat or drink for days? Chen: Then you'd die of starvation and dehydration. Abby: Caused by boredom.
(as Hersch is being transferred to another hospital) Hersch: I've never been in a Catholic hospital. Romano: Well, you'll like the nuns. Nice calves.
(Elizabeth meets her mother at a restaurant) Isabelle Corday: You're late. Elizabeth: I had a bowel resection. Isabelle Corday: Before lunch? Lovely. Elizabeth: I washed my hands.
Carter: You could get a tattoo. Abby: I could get "Carter... Carter: Yeah... Abby: ...Sucks."
(Abby and Carter are walking on the beach) Abby: Chaos theory? Carter: Yeah; a virus mutates in the Congo, we evacuate an ER in Chicago, Romano gets his arm cut off... Abby: You lost me. Carter: Seemingly random events, all part of a larger equation. Abby: I'm hot. Carter: A butterfly flaps it's wings in China and creates a tornado half way around the world. Abby: Are you hot? Carter: I'm saying there is an inherent unpredictability about everything: evolution, life, love, relationships. Abby: So what am I? The butterfly or the tornado? Carter: No, you are chaos in general. Abby: Thanks! Carter: I'm just saying, you're chaos to me, the unknown in me. And I'm your chaos, too. Abby: You're hardly chaos, Carter! (they are in front of the sea, staring at it) Carter: I'm just saying there's a risk in anything that you do. Don't you want to get the odds in your favor? I'm drawn to you. It's kind of that simple. I've been drawn to you for two years, but chaos always seem to rule and I don't want it to rule. I want to know where it's taking me. You know what I mean... (Abby has been taking off her clothes) Abby: No! (she goes to the water) Carter: The tornado, definitely the tornado! Abby: Are you coming?
Carter: You want me to talk to you? I want to help you, not because I'm a nice guy, or because I'm worried about you, but because I want to be with you. Abby: You want to fix me. Carter: I want to help you. Abby: You want to fix me so I'm good enough. Carter: No, I want it to work. Abby: Well, I'm not broken.
Chen: I take back everything I said about you, Pratt. Pratt: Really? Chen: No, but thanks for the pizza.
Susan: We need to evacuate. Carter: The ER? Susan: The entire hospital. Everybody but you.
Susan: You know Kerry, I think we did a great job, all things considered. Kerry: Yeah, we kicked ass.
Abby: (referring to the monkeypox) Do you think someone did this on purpose? Carter: Does it matter? Viruses mutate. That's what they do. We're more likely to control bio terrorism than Mother Nature.
Romano: (talking on the phone) Hello, who's this? You like your job? You wanna keep it? Well, then you tell your chief of staff, you know who that is? Good! Well, you tell "Jonesy" that Robert Romano is sending over four critical patients, all of whom I expect to be treated like his own mother, but without the inappropriate touching!
Romano: (regaining consciousness) Oh, no. I'm at County.
After Eriq La Salle's departure, Paul McCrane takes over the "and" credit role in the opening theme.
Diane Delano (who portrays Stella Willis, a character who appears in the first four episodes of Season 9) made a previous guest star appearance as a different character in the Season 3 episode "Fortune's Fools."
This episode won an Emmy Award for Outstanding Single Camera Sound Mixing for a Series, and was nominated for Outstanding Sound Editing for a Series.
Previous title: "Unknown Origin"
Mekhi Phifer becomes a series regular with this episode.
According to an article in the October 14, 2002 issue of People, Yvette Freeman (Nurse Haleh Adams) didn't appear in this episode (which takes place just 15 minutes in time after "Lockdown," last season's finale) because she lost 117 pounds over the summer hiatus; the producers realized there was no believable way to incorporate such a dramatic weight loss into the story.
Title: "Chaos Theory" Strictly speaking, chaos theory refers to the branch of mathematics that deals with complex systems that are predictable in principle but unpredictable in practice. In other words, these systems obey predictable rules, but their behavior is so sensitive to slight changes in conditions that small, localized occurences in one part of the system are magnified over time and can have widespread consequences throughout the system. This can significantly affect the outcomes of seemingly unrelated events, causing unexpected final results and thus giving an impression of randomness. The classic example often used to describe this concept is the "butterfly effect"; the beating of a butterfly's wings can lead to a hurricane if the tiny turbulence it causes happens to generate a critical combination of air pressure changes.
S 15 : Ep 22
Aired 4/2/09 (1:24:58)
S 15 : Ep 21
Aired 3/26/09 (43:37)
S 15 : Ep 20
Aired 3/19/09 (43:44)
S 15 : Ep 19
Aired 3/12/09 (43:40)
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