Actor Allusion: Principal Franklin's daughter Emily was named after Tim Russ' real-life daughter who is also a fan of the show.
Adored by the Network: Nickelodeon will often show nothing but this show and SpongeBob all day and treat it better than the others, though it has been replaced somewhat with Victorious.
Fan Nickname: Some people who don't ship the Sam/Freddie relationship have called the the second half of Season 4 iSeddie or iSam, due to the Seddie shipping arc taking up 4 out of the 9 episodes filmed and Sam and Freddie together continually taking the A-Plot with Carly pushed down to the B-plot or C-plot in pretty much every episode, especially as some episodes had Carly completely absent or in a plot completely away from the rest of the main cast. Many consider it a Spinoff or Continuity Reboot instead of a new season with characters who look, sound and share the same names, but aren't the same characters from previous seasons.
Ironically, Sam was eventually given a spin-off show called Sam & Cat.
The imaginative, pejorative names of "Sucky" and "Cruddie" for Seddie and Creddie respectively.
One of the calendar props on the walls of their school during the Green Aesop episode included a photo of actor Ed Begley, Jr., known for his support of "green" causes, and also known as the Dean of Hearst College from Veronica Mars.
In iReunite With Missy, you might recognize Missy if you've seen Gwen from the live-action Ben10 film and young Jean Grey from X3: The Last Stand, it's Haley Ramm. Schneider took the actress to play the role of Carly's best friend because Ramm and Cosgrove are also real-life best friends.
Taran Killam (once a cast member on Nickelodeon's The Amanda Show, now a repertory player on Saturday Night Live and was once MADtv's youngest cast member at only 19 years old) gets a small role as a Secret Service agent in iMeet the First Lady. You probably didn't notice him due to the episode's other guest star, Michelle freakin' Obama!
In some commercials for the show's merchandise, Carly & Sam are represented by Rocky Blue and Lexi Reed, respectively.
Emma Stone had a cameo in one of the later episodes of the show.
What was Hal Mason doing in Seattle, making out with Carly?
Lying Creator: The week before the "iSaved Your Life" episode aired, a promo aired showing Carly/Freddie kissing. Dan Schneider, in an effort to calm the shippers of the Sam/Freddie pairing, implied it might not be what it appeared. Cue the episode, where they ended up kissing 7 or 8 times, and it was as it appeared.
He posted a picture of Carly and Freddie kissing as a tease for iSpeed Date.. then cut the kiss out later because of a kiss would have impacted on the story of iSaved Your Life. The kiss was likely to have been removed from the script before filming because they would have done the 2nd script already, so he basically created a blatant piece of lying Ship Tease for no reason..
Periphery Demographic: Each season skewed older than the last as word got out among adults and the original target cohort grew up.
Screwed by the Network: After season three, Nick has taken a decidedly inconsistent approach to the show. It only orders 13 episodes at at time compared to the 26 or so that it was doing in the first three, it airs the show at random times, advertises that the entire season will be played every week, then stops it after 3 episodes, puts on new episodes with little advertising, and then starts putting them on at weird times, such as Wednesday the 28th of December for the second blooper episode, and then 8-9pm New Year's Eve for the iPsycho sequel. Admittedly, Dan Schneider has to take some of the blame, as he seems to have poor time management, which means Nick were only ordering 13 episodes of both iCarly and Victorious when they could have fit full seasons in even with the studio split (the two shows share the same studio space, and can't film when the other is filming) taken into account. This odd handling of the show and it's timeslots is one the bigger reasons for the abysmal ratings for Season 5 compared to seasons 2, 3 and 4.
Why Fandom Can't Have Nice Things: Before Season 3 had started airing, Dan posted a script fragment from a future episode◊. He took it down quickly, but it was reposted on various sites. Naturally, shippers from both sides went nuts, especially on LiveJournal. After heavy criticism about Dan ruining the fandom and the LJ communities with his interaction he quit and deleted his LiveJournal, without warning or notice (meaning the fandom lost alot of interesting interaction with him), and eventually setup his own blog site, which he claimed was for better control, but his first post was about being pissed off with reponses to his script.
Word of God: Dan Schneider. Very carefully avoids Lying Creator by using ambiguous meanings, hypothetical, counter-questions in response to questions and shrowding common shipping viewpoints in terms of what "his friends" might think about what's happening. Was very active in the fandom up to the start of Season 3, although not as much now that he's dealing with Victorious as well as the 4th season of iCarly.
Taken to the extreme with his post about the finale iGoodbye. After seeing Internet Backdraft about his failure to make the Seddie pairing canon while he made Creddie canon via a typical Last Minute Hookup, he wrote a blog that could be described in short as "completely inverting the meaning of what just took place on screen" by attempting to claim the Last Minute Hookup, the romantic moment Carly comes up to the studio, takes Freddie by the hand then kisses him just moments before leaving for Italy may have actually been a platonic 'friendship' kiss. This did not go down well in the fandom, with people calling him out for the Blatant Lies, many female viewers were especially upset about the idea that they just go around passionately kissing their male friends to show their friendship. This is a good example of Word of God actually making the understanding of what took place on their show less clear. Then again, it was likely deliberate as Dan has the new Spin-OffSam & Cat, and he wanted to dangle the potential of the Seddie relationship picking up on that show to get more viewers. Most people in the fandom have simply ignored him and have gone by what took place on screen.
What Could Have Been: The original name of the Carly character was going to be Sam. The female sidekick was going to be called Kira. But they couldn't get the iSam domain name. So Sam became Carly, and Kira became Sam. This has the curious effect of swapping around the Portmanteau Couple Name of both major ships. The Just Friends Creddie ship would have been known as Seddie, while the Jerk Ass Seddie ship would have been known as Kreddie. It would have a minor impact on the Les Yay Cam ship by changing the name from Cam (Carly/Sam) to Kam (Kira/Sam).
Dan Schneider originally explored a straight Drake & Josh spin-off as a Miranda Cosgrove vehicle, with Miranda naturally reprising her role as Megan Parker, but ultimately he felt dissatisfied with every idea centered around that concept he could think of. He then explored the idea of a fresh concept and character that was getting closer to iCarly, but centered around a girl who suddenly found herself getting her own variety TV show. He got as far as writing the script for the pilot - and then threw it in the trash, once again being dissatisfied. He then changed the "TV show" to "web show", and things finally started to click.
A second iCarly spin-off centered around Gibby (and titled as such) had a pilot filmed but was not picked up. As originally envisioned by Dan, it would have ran alongside Sam & Cat and Victorious.