Director Ken Olin and writers Jesse Alexander and Jeff Pinkner are the only crew members that directed or wrote episodes in every season. Olin directed 23, Alexander wrote 11 and Pinker 12, including the series finale.
During the opening credits, the Rambaldi symbol
Sydney's APO code name is Phoenix. (Very clever, since the phoenix is said to "rise from the ashes.")
There are seventeen regular actors through the five seasons of the show, but the only actors who were regulars for the whole show were Jennifer Garner, Victor Garber, Ron Rifkin, Kevin Weissman and Carl Lumbly. However, Michael Vartan, Greg Grunberg and David Anders appear in every season of the show. Merrin Dungey and Bradley Cooper appear in all but one season. Lena Olin appears in season 2, 4 and 5.
Lena Olin was never fired from the show, nor was her character written out as a result of a contract dispute. Lena Olin did not want to rejoin the cast because she lives in Manhattan with her family and did not want to commute back and forth to Los Angeles for filming. To "cope" with Lena's departure, her character was killed off at the hands of Jack. Afterwards, Lena was available, and Irina was revealed to be alive.
Vaughn's mother's maiden name is "Delorme", which is part of the last name of co-producer Tiffany Rocquemore-Delorme.
The two-part episode, "The Box" where rogue agents take over SD-6, has a plot similar to Die Hard (1988). The van that the rogue agents pull up in has the name McTiernan written on the side. John McTiernan was the director of Die Hard.
Jennifer Garner auditioned five times for the part of Sydney Bristow.
Sidney's CIA code name is Mountaineer. This is an inside joke, as Jennifer Garner is from West Virginia. West Virginia University is known as the Mountaineers.
After episode #2.13 (Phase One) the show's prominent use of cliffhangers at every episode's end was abandoned for a more traditional (one episode, one story) way of storytelling. This was apparently done due to demands from ABC TV execs who were under the impression that new viewers wouldn't "get" the show and feared the drop of ratings.
Series creator J.J. Abrams wrote and performed the music for the opening sequence.
Though be supposed Russian, actresses playing Sydney's mother and aunts (her sisters) are respectively Swedish, Italian and Brazilian.
Sydney's middle name is Anne, as is Jennifer Garner's.
The first reference to number 47 happens on the pilot episode, when Marshall express his own desire to make a cam with 47 stills.
Creator J.J. Abrams says the idea for the show came from a half-joking story plot for his series Felicity (1998). Abrams considered an episode where Felicity spends her summer as a government agent, then returns to school the next fall like nothing ever happened.
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