If Milo can compute all the probabilities, it's not clear why he doesn't compute the likelihood of Fringe Division becoming involved because he uses the same bus-related murder method using a ballpoint pen. Varying his pattern between the two murders would have made it all but impossible for Fringe Division to realize that the murders were deliberate. Even a non-genius could realize that using the same method twice in a row would increase the likelihood of detection.
Trivia: The glyph code for this episode is BREACH.
Trivia: The Observer can be seen on the bridge near Milo as Olivia notices the latter.
Alternate Earth general differences:
- Ballpoint pens are rare.
- There is an outbreak of Smallpox in the United States (specifically in Texas).
- Avocados are rare.
- Construction workers wear silver hardhats.
- A homeless man has a sign saying that he was a vet of the Aruba War.
Peter: You're not from this world, Olivia. You're not her.
Olivia: You're not real.
Peter: Real is just a matter of perception. I am here. And I'm a part of you that you have to hold onto. You can't forget who you are, Olivia. You can't forget where you're from. You can't forget this. (kisses her)
Charlie: You do remember me, right?
Olivia: Yeah. You're that tightwad who owes me $70.
Charlie: Damn it! I was--I was hoping you'd forget about that.
Charlie: As hospitals go, not bad.
Olivia: Yeah, unless it's run by an evil genius that's using accidents to kill people.
Alt Brandon: Do you miss it?
Secretary Bishop: Miss what?
Alt Brandon: Being a scientist.
Secretary Bishop: I am still a scientist, Brandon. I just have a much larger laboratory.
Blair Brown is credited but doesn't appear.
The end credits feature a special thanks to Oliver Wyman.
Kirk Acevedo is credited as Guest Appearance by.
Canada: October 7, 2010 on Citytv
UK: October 19, 2010 on Sky1
Latin America: November 16, 2010 on Warner Channel
Australia: November 24, 2010 on GO!
Germany: January 24, 2011 on ProSieben
Finland: September 21, 2011 on MTV3
Poland: February 6, 2012 on TVN
Czech Republic: January 14, 2013 on FANDA
Charlie: Now that you two have, uh, rediscovered your Vulcan mind meld...
Referencing the Star Trek series, where one of the primary alien races, the Vulcans, have the ability to "mind meld" with others beings, both their own species and others. The experience is less than telepathy than a mutual and often uncontrolled sharing of thoughts between the two individuals involved.