The awning in front of Liz Lemon's apartment has displayed two different addresses over the course of the show. In some episodes the address is 160 Riverside Drive and in other shows the address is 168 Riverside Drive. The former is the real address of the exterior building shown and it is directly across the street from the exterior building used on Will & Grace. In an audio commentary Tina Fey jokes that they should've shown Eric McCormick (star of Will & Grace) walking out of that building.
In her 2011 book "Bossypants," Tina Fey said that during the early years of 30 Rock, Donald Glover was its only black writer. She also said that he was so young that when he started on the writing staff, he was still living in an NYU dorm and working there as a Resident Adviser. Since he came from a large family in Stone Mountain, Georgia, Fey said that Glover was especially good at writing for the character of Kenneth, who was also supposed to be from Stone Mountain. Glover later became a star as an actor on the TV show Community (2009).
One of the reasons Jane Krakowski was drawn to the series was because it gave her the chance to sing and dance. Sitcoms today don't usually allow for that - this was the first since Ally McBeal (1997).
Alec Baldwin won the SAG Award for Outstanding Actor in a Comedy Series every year since the show's inception until 2013, a feat held by no other actor in either drama or comedy. In addition he won another one in 2009 as part of the cast. He was also nominated for the last time in 2014, but failed to win that time, probably because the show ended in January 2013.
In 2012 Tina Fey explained the Emmy in Liz Lemon's office: "I've always sort of thought that it's a Daytime Emmy and that perhaps she got it for writing a really specific category, like Best Regional Promo for the show The Mommies (1993) or something like that . . . [Or] for writing jokes for Joy Behar for The View (2001)--it's definitely a Daytime Emmy. It's a local Daytime Emmy."
Tina Fey had to leave Saturday Night Live (1975) in order to appear in the show (the schedules overlapped). Rachel Dratch also left the show at this time, as she was set to play Jenna DeCarlo. After appearing in the first version of the pilot, Dratch was replaced by Jane Krakowski and given bit parts during the first season.
On December 29, 2006, Nielsen Media Research reported the results of having, for the first time, monitored viewers who use a digital video recorder to record shows for later viewing. According to the Nielsen numbers, "30 Rock" had the fifth-largest increase (viewers who use a DVR to record the show and then watch it within a week of its initial airing). According to Nielsen, the show adds nearly 7.5% to its total audience every week as a result of these "live plus seven" viewers
Tina Fey originally pitched a series about a cable news producer who is forced to produce a show hosted by a right-wing pundit. Rachel Dratch and Alec Baldwin, respectively, would have played the roles, but NBC suggested a show based on her Saturday Night Live (1975) experiences instead.
Jane Krakowski and Cheyenne Jackson both originated the lead roles in the workshop of "Xanadu" for Broadway. Krakowski left the show before it premiered to star in "30 Rock" instead. Jackson decided to leave the show because he did not want to perform without her. He ended up returning when the replacement actor broke his ankle only a short while before the show opened. Both have since appeared on "30 Rock" together, where their close real-life friendship is reversed, with Jenna resenting Jackson's character and he being disgusted by her constant rude behavior.
Characters Liz and Jenna began "The Girlie Show" at The Second City in Chicago. In 1992 Tina Fey took classes there and in 1994 was invited to join the cast. Her writing partner was Rachel Dratch and their time together inspired the relationship between Liz and Jenna.
The same year that "30 Rock" started airing, Studio 60 on the Sunset Strip (2006), another show set behind the scenes of a fictional Saturday Night Live (1975)-type show, also premiered. Even though there were many differences between them (including "30 Rock" being a half-hour sitcom while "Studio 60" was an hour-long drama), many critics compared the two shows and engaged in speculation about which one would survive. "Studio 60" was canceled after one season, and creator Aaron Sorkin and former regular Nate Corddry both went on to guest-star on "30 Rock."
In an episode of Season one, Jack (Alec Baldwin) mentions watching "Friends" (1994) and makes several references to the show. Baldwin made an appearance in Friends as Parker, the overly enthusiastic guy Phoebe goes out with in Season 8. Also, David Schwimmer and Jennifer Aniston (Ross and Rachel in Friends) both guest starred in 30 Rock during Seasons 2 and 3 (Schwimmer in Season 2 and Aniston in Season 3 respectively).
Andrea Martin was offered the role of Margaret Lemon but her commitments to the Broadway musical adaptation of Young Frankenstein (1974) prevented her from appearing. Martin later guest starred as Bonnie Badamath.
Before Will Forte played Paul, Jenna's boyfriend and Jenna impersonator in later episodes, he appeared in Season 1 Episode 12 "Black Tie" as "Tomas" the assistant to Austrian Prince Gerhardt, played by Paul Reubens. In the episode, he tells Jenna that the Prince wishes to meet her and introduces them.
Jack Donaghy is a staunch conservative Republican who looks down on anything he considers even remotely liberal. In real life, Alec Baldwin is a staunch Democrat famous for his liberal political views.
In 30 Rock: The Ones (2009) Kenneth states his real name shortly before suffering an allergic shock being Dick Whitman. Dick Whitman is also the real name of Don Draper, one of the Main Characters of "Mad Men (2007)" which Jon Hamm (one of Liz's love interests) starred in.
Tina Fey (Liz Lemon), Jack McBrayer (Kenneth Parcell), and Scott Adsit (Pete Hornberger) have all provided their voices for work in Disney films. Fey in Monkey Kingdom (2015), McBrayer starred as Fix It Felix in Wreck It Ralph (2012), and Adsit as Baymax in Big Hero 6 (2014).
The trivia items below may give away important plot points.
Over the course of the series, there were many hints that Kenneth was considerably older than the character's outward appearance would suggest (the actor who plays Kenneth, Jack McBrayer, was in his early 30s when "30 Rock" started). These include: Kenneth's recognition of TV pop culture from decades before he logically would have been born; he's familiar with the laws of the Roman Republic and fluent in Latin; his anxiety in "Don Geiss, America and Hope" that NBC will start limiting and verifying the ages of their pages and his concern in "The Problem Solvers" that people in the office have been spreading a rumor that he's "been alive forever"; his memory that an eight-year-old 'Shirley Temple (I)' taught him how to roll cigarettes; his refusal to tell Suze Orman his age in "Today You Are a Man"; his on-screen identification as "Kenneth Parcell: Elderly Page" in "Queen of Jordan"; and many other jokes and references. In the episode "Governor Dunston," Kenneth's mother (Catherine O'Hara) visits and tells Jenna that Kenneth has "always been a special boy. I remember the day he was born. He looked up at me and said, 'Momma, I am not a person. My body's just a flesh vessel for an immortal being whose name if you heard it would make you lose your mind.'" In the last episode of the series, Kenneth looks to be exactly the same even many decades in the future, still the president of NBC, hearing a series pitch from Liz's great-granddaughter; many viewers speculated that that meant that Kenneth is actually immortal.
Kenneth said in an episode that when he first started at NBC, an 8 year old Shirley Temple taught him how to roll a cigarette. Shirley Temple was born in 1928 which means Kenneth started at NBC in 1936.
The show often pokes fun at themes and characters that the show leaves hanging. For example, in one episode, Kenneth tells Liz that no more mail could fit into her box because it was stuffed with unopened adoption letters, hinting at Liz's disappeared interest to adopt a child. Another instance is the character of Danny Baker. In one episode, Pete tells Danny that he would've asked Danny to do a favor for him, but he forgot he works at TGS, poking fun at the fact that Danny often goes missing for several episodes at a time. Again, in the 100th episode, Danny states that he remembers season 1 of TGS, even though he hadn't worked there yet, but then later in the episode has Josh's flashbacks, meaning that Danny and Josh share the same fate in which they both appear in several episodes and then are never heard from again.
Elizabeth Banks played a character on Scrubs (2001) who was impregnated by a character named J.D. (John Dorian). On "30 Rock", she was impregnated by another character with initials J.D. (Jack Donaghy).