Question: Why was a live episode of the show broadcast twice on the evening of October 14, 2010?
About the article "30 Rock", section "Season 5".

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The fifth season of "30 Rock", an American television comedy series on the NBC network in the United States, began airing on September 23, 2010.
NBC announced on March 5, 2010 that "30 Rock" would be returning for a fifth season in the 2010–2011 television season.
Beginning with episode 11, "30 Rock" was moved to the 10:00 PM timeslot, but, as a consolation, was renewed earlier than the other NBC sitcoms.
During this time, Tracy Morgan underwent an emergency operation, causing his character to be written out for several episodes.
On July 31, 2010, NBC announced that an episode of "30 Rock"'s fifth season would be filmed and broadcast live, twice, on the evening of October 14, 2010.
The two separate recordings resulted in a live telecast of the episode to American viewers in both the West and East Coast.
The episode was a ratings success and was met with very positive reviews.
The season also featured the show's 100th episode, which aired as a one-hour episode. 
"30 Rock" premiered its fifth season on September 23, 2010 in the Thursday 8:30 p.m. time slot.
An episode of 30 Rock's fifth season was filmed and broadcast live, twice, on the evening of October 14, 2010.
The two separate recordings resulted in a live telecast of the episode to American viewers in both the West and East Coast, to ensure both would view a live performance.
Filmed in front of a live audience, the episode aired at 8:30 pm EDT and PDT on NBC.
A ratings success, the episode was also met with positive reviews.
"30 Rock" moved to the 10/9c from January 20, 2011.
Season 5 focuses on Liz Lemon's continuing relationship with Carol Burnett (Matt Damon), Jack's start into fatherhood with fiancée Avery (Elizabeth Banks), struggling with the merger of NBCUniversal with Kabletown, Tracy's foray into getting an EGOT, and Kenneth's attempt to get back to NBC.
Aside from featuring the return of Rachel Dratch in the Live Show, other guest stars include Matt Damon, Elizabeth Banks, Susan Sarandon (as Frank's former teacher- who was in prison due to their relationship while he was a student- and present girlfriend), Paul Giamatti, Sherri Shepherd, Queen Latifah, Rob Reiner, John Amos, Jon Hamm, Julia Louis-Dreyfus, Bill Hader, Chris Parnell, Kelsey Grammer, Buck Henry, David Gregory, John Slattery, Daniel Sunjata, Will Forte, Kelly Coffield Park, Elaine Stritch, Dr. Condoleezza Rice, Alan Alda, Cheyenne Jackson, Robert De Niro, Dean Winters, Ken Howard, Vanessa Minnillo, Brian Williams, Richard Belzer, Ice-T, John Cho, Chloë Grace Moretz, Terrance Mann (as oceanographer Robert Ballard), Cristin Milioti (as Abby Flynn in "TGS Hates Women"), Eion Bailey, Adriane Lenox, Michael Keaton, Margaret Cho (as Avery's kidnapper, Korean dictator Kim Jong-il), and Tom Hanks.
"Live Show" was co-written by series creator, executive producer, and lead actress Fey and co-showrunner and executive producer Robert Carlock.
It was directed by Beth McCarthy-Miller, a long-time television director who worked with Fey on the sketch comedy show "Saturday Night Live".
On July 30, 2010, the NBC network announced that an episode of "30 Rock"s fifth season would be filmed and broadcast live on two occasions in the evening of October 14, 2010.
The decision was made in part due to lagging ratings for all of NBC's Must-See TV line-up.
The idea was originally conceived during the 2007–2008 Writers Guild of America strike, when the cast performed two live versions of the season two episode "Secrets and Lies" as a benefit at the Upright Citizens Brigade Theatre in New York City.
When asked by "Entertainment Weekly" the reason of doing a live episode, Fey said "live performance was what made us think that it would be fun to do live episode.
And how far we've come... Now we're going to do it on TV."
In this same interview, Fey revealed that the episode would also be performed in front of a live audience.
"It will be exciting for us to do it for a live audience and see if we get live laughter."
Fey noted that the experience "was so fun to feel the different timing of the show live and the audience response, which you just don't get in a single-camera show."
In another interview, Fey revealed that the staff have talked about doing a live show for years "because we felt we had sort of interesting personnel for it."
Following the conclusion of the writers' strike they spoke to NBC about performing live and attempted to film it during the fourth season; however, they were unable to schedule it.
For the fifth season, the writing staff began planning the live performance and waited until McCarthy-Miller—a recurring "30 Rock" director—was available to helm it.
Fey and Carlock said in separate discussions that another decision to do this episode of "30 Rock" was based on the cast having theater and improvisation experience.
Alec Baldwin had previously performed in the East and West live broadcasts of the "Will & Grace" premiere episode, "Alive and Schticking".
Prior to the broadcast, the cast rehearsed "Live Show" for three days and had one rehearsal before a live audience the day of broadcast.
The two separate broadcasts of the episode resulted in a live telecast to American viewers in both the East and West Coasts of the United States—the crew briefly considered a third broadcast for the Midwest, but decided against it.
The initial East Coast broadcast included a theme song sung by Jane Krakowski and the later West Coast version's song was performed by Cheyenne Jackson—the two also performed to warm-up the crowd in the rehearsal.
In addition, the two episodes had a few scripted differences, such as the lyrics to Spaceman's song, Liz Lemon mocks Jack Donaghy's office assistant Jonathan by referring to him as a character from "Slumdog Millionaire" in the East Coast broadcast and as Aladdin in the West Coast airing, and the subtitle in the Fox News skit.
Additionally, the fictional commercial that featured Drew Baird is different—in the initial airing, he is given a hand transplant from an executed black man; in the second, he has a woman's hand.
This episode marks Rachel Dratch's first appearance on "30 Rock" since season one, and her first work since giving birth to her son Eli on August 24, 2010. 
"Cleveland Live!"
was broadcast on October 3, 2010, as a part of an animated television night on Fox, and was preceded by "The Simpsons" and was followed by "Family Guy" and the 100th episode of "American Dad!".
It was watched by 6.65 million viewers, according to Nielsen ratings.
The episode also acquired a 3.1 rating in the 18–49 demographic, beating "American Dad!".
The episode's ratings increased slightly from the show's season premiere.
In a simultaneous review of the episodes of "The Simpsons" that preceded the show, and the broadcast of "Family Guy" and "American Dad!"
that followed it, The A.V.
Club's Rowan Kaiser gave a negative review to the episode, going as far as to say he is "not entirely certain why this show exists," as he says it is "complete with unfunny jokes, audience laughter, and more terrible meta-humor than you could ever possibly want".
Despite the criticism, Kaiser did point out positive highlights of the episode, saying Julia Roberts' sudden appearance and subsequent death "got a laugh out of me" and admitted the "visual gag of the couch spinning into a gun rack was kind of clever."
Nonetheless, concluding his review, he ultimately rated the episode an F. 
"Jeopardy!"
has included Chattanooga in either a question or answer numerous times since the late 1980s.
"Police POV", "COPS", and the MTV show "Cuff'd" have shown members of the Chattanooga Police Department apprehending suspects.
"The Steps" (a locally produced web series)   "Trading Spouses: Meet Your New Mommy" ("Hammond/Howard" episode, originally broadcast January 17 and 24, 2005)  "Who Do You Think You Are?"
("Lionel Richie" episode, originally broadcast March 4, 2011)