Channel Hop: Due to Disney acquiring Lucasfilm, the series was pulled from Cartoon Network after its fifth season concluded, most likely because the prospect of Ted Turner profiting off a Disney-owned IP was unfathomable to Bob Iger. The sixth and final season wound up on Netflix.
Contractual Immortality: No matter how dire the situation, we already know Anakin and Obi-Wan are going to live, as well as everyone else who was in Revenge Of The Sith. One of the strengths of the series, though, was introducing a vast number of new characters for the series who weren't guaranteed to survive (including main characters like Ahsoka and every clone besides Commander Cody).
Doing It for the Art: The amount of work put into this series really shows how much the crew cared about it, even just observing from the surface. But when you start noticing and then paying attention to such trivial things like posters on the walls of clone barracks or clubs, the elaborate details on spaceships, bugs crawling around on branches, garbage thrown away on the lower streets of Coruscant, and dozens of other tiny little background details the creators have sneaked in - despite the fact that most viewers probably wouldn't register any of it the first time viewing - it becomes mind-blowing! Then consider that all of this is made in CGI, with a relatively low budget when the series was only starting. And when their budget and technological assets increased as the series progressed, they did even more with it.
Going even further, they had assets to use from Lucasfilm's archives. For instance, during the production of Season 3 episode "Wookiee Hunt", the crew had a meeting with Peter Mayhew to make sure they got Chewbacca's appearance (while working within the art style of the show), characterization and body language accurately.
Executive Meddling: George Lucas, being an executive producer, had a say in certain creative decisions (usually for minor things) that would override decisions made by the writers - for instance, it was actually a last-minute suggestion on his part that led to Ziro the Hutt acquiring his speech pattern. Interestingly, it was also Lucas who suggested to design Cad Bane to be Lee Van Cleefin space, and his changes generally didn't interfere with how the stories themselves were told, so it works both ways.
Executive Veto: George Lucas occasionally exercises this power on the show. For instance, the finale of The Lost Missions ends on the planet Korriban - however, the term "Moraband" came up during discussion, and Lucas suggested that it should be the planet's canonical name. A writer later added that "Korriban" is simply an alternative name.
Fan Nickname: A few show up. Savage Oppress is Randy, Anakin is Mannequin, and Ahsoka is Orange Buttcheeks.
In regards to the Season 5 Mandalore arc, we get "Mauldalore" and "Mauldalorians" due to Darth Maul taking over the planet.
Limited Special Collector's Ultimate Edition: All the individuals Season's DVD and Blu-ray releases contained massive amounts of bonus content, but the Seasons 1-5 Collector's Edition took it even further: it includes the entire series, hours of bonus contents, an episode guide, and the 54-page artbook. And it costs just slightly above the half of the combined cost of the individual Season releases.
Never Trust a Trailer: In the trailer for the Season 5 finale, the colour of Anakin's second lightsaber was changed to green so that viewers wouldn't be as likely to suspect that Barriss was behind the Temple bombing.
No Export for You: The Lost Missions (Season 6), which was only released in the US, Canada, Germany and Australia, but even then Australia had to wait for the home video versions.
Official Fan-Submitted Content: The lightsaber technique "Whirlwind of Destiny" used by Petro in "A Test of Strength" was created by nine-year-old Brendon Lake for Hasbro's "Join the Jedi" contest.
The Other Darrin: All characters from the live-action Star Wars movies are voiced by different actors in the Clone Wars series, except for the following ones:
Anthony Daniels returned as C-3PO,
After a few episodes with B.J. Hughes voicing Jar Jar, Ahmed Best returned to the role of the clumsy gungan.
Matthew Wood as General Grievous.
Liam Neeson and Pernilla August reprised their roles as Qui-Gonn Jinn and Shmi Skywalker in "Overlords".
Daniel Logan as Boba Fett and the clone cadets (aside from one who was voiced by Dee Bradley Baker).
Samuel L. Jackson and Christopher Lee reprised their roles as Windu and Dooku respectively in the Pilotmovie before being replaced in the series itself.
After the passing of Ian Abercrombie, Tim Curry takes over as the voice of Chancellor Palpatine.
The Other Marty: When the the three original episodes were edited and released as a feature film, Christopher Lee returned to voice Count Dooku. Corey Burton, who plays Dooku in the ongoing series, had already recorded his lines and Lee re-recorded them, matching his performance to the already-rendered images.
Role Reprisal: The German dub had almost everyone from the live action movies reprising their roles for this series.
Screwed by the Lawyers: Just like what happened to certain othershows when Disney purchased Marvel, Clone Wars ended up getting cancelled after Disney decided they'd rather invest in their own cartoon. The silver lining though is the remainder of the series will air on Netflix.
James Arnold Taylor is voicing Obi-Wan, Plo Koon, Osi Sobeck and Rako Hardeen (both the real one, and while Obi-Wan was posing as him). Hilariously lampshaded in "Counterattack", after Osi Sobeck captured Obi-Wan and his group:
This is exploited in Season 4's Deception arc, where James voices both Obi-Wan and Rako Hardeen (both the disguised Obi-Wan and the real Hardeen). This was a deliberate choice in that since Obi-Wan was undercover as him, Hardeen needed to be voiced by someone familiar enough with playing Obi-Wan's character.
Dee Bradley Baker voices all of the clone troopers as well as Bossk. The former gets taken Up to Eleven during the Umbara arc, where the majority of the dialogue comes from him and Dave Fennoy, Pong Krell's voice actor. In fact, the cast list for "Carnage of Krell" has only three voice actors listed: Baker, Fennoy and Tom Kane (the opening narrator).
Corey Burton voices Cad Bane, Count Dooku and Ziro the Hutt. Narrowly averted between Ziro and Dooku, as while the two of them are both played by Corey Burton in the series, they conversed with each other only in The Movie, in which Christopher Lee returned to play his role as Dooku.
This does happen, however, in "Hostage Crisis" when Cad Bane and Ziro converse after the latter is rescued by the former.
At the end of "A Necessary Bond", Huyang mentioned that the last Jedi youngling who had such an adventure while building his lightsaber was Yoda. Hearing this the younglings immediately started to demand the story, just for Obi-Wan to quickly put them down, telling them that's Another Story for Another Time.
Many haters and even a large numbert of fans were hoping that Ahsoka would eventually die in the series for various reasons (continuity, to give Anakin a huge push towards the Dark Side, etc). In the penultimate episode of the entire series, after her "fate" has already been resolved, a dying Ahsoka appears in a vision for Yoda.
R2-D2's faux Heroic Sacrifice in "Point of No Return" could be seen as this in regards to the fact that characters who appear in Revenge of the Sith or the Original Trilogy can't die in this series. By putting him in the middle of a large colorful explosion that nearly destroyed his body, it's like they said "Sure we can't kill him, but that doesn't mean we can't blow him to pieces". He is promptly salvaged from the wreckage and rebuilt minutes later.
Throughout the years, Filoni was repeadly asked on conventions whether Ben Quadinaros will make an appearance on the show. In "The Rise of Clovis" Anakin has a pod-racer poster on the wall of his quarters in the Jedi Temple, with pictures of Quadinaros and Sebulba on it.
The Season 1 episode, The Lair of Grievous, was produced by famous anime studio, Production I.G. The episode won Golden Reel Award, for best sound editing in television animation.
During the Clone Wars panel at the 2010 Comic-Con International, Guinness World Records editor Craig Glenday took the stage to present the series with a certificate proclaiming "The Clone Wars as the highest rated sci-fi animation currently on television".
The title logo at the beginning of "Brothers" and "Revenge" was changed to red, as an homage to Darth Maul's return.
Similarly, the D-Squad arc episodes had blue logo as an homeage to R2.
Kevin Kiner had flown to Prague and hired a full chez orchestra for the recording of the soundtrack of the four-part Season 5 finale arc, and he did it on his own time, out of his own wallet.
"The Wrong Jedi" and "Sacrifice" are the only episodes which end with a Fade Out, and without the usual ending theme. The latter is replaced by Ahsoka's theme, played by the aformentioned full orchestra.
The series won two-two Daytime Emmy Awards in 2013 and 2014:
Outstanding Special Class Animated Program in both years
David Tennant won "Outstanding Performer in an Animated Program" for his role as Professor Huyang.
Outstanding Individual Achivement in Animation for Christopher Voy, on his work on the animation of "To Catch a Jedi".