In order to make the Clone Troopers sound like individuals, Dee Bradley Baker recorded every voice separately and gave each one a different inflection. He liked to write down a particular adjective for each one. For instance some sound a bit younger, others a bit more proper whereas another may sound like a bully or a grunt. During later seasons, he was able to record all the voices in the same take.
Dave Filoni based the character of Ahsoka Tano on the mannerisms Carrie Fisher displayed as Princess Leia in the original Star Wars trilogy. Further more, she combines Anakin's brashness with Obi-Wan's measured judgment, reflecting the shift between the Republic and the oncoming Empire.
It is an unwritten rule in films to have the good guys move from left to right and the bad guys right to left during battle scenes. The Clone Wars series, like Star Wars: Episode II - Attack of the Clones (2002) before it, shows the Republic Forces (the good guys) moving from right to left. This foreshadows the Clone Army becoming the Imperial army (the bad guys).
The series is presented as an anthology, meaning the stories are not shown in a strict chronological order but can jump around in the time-line. This is much like George Lucas previous television series The Young Indiana Jones Chronicles (1992).
The series started the same year that the video game Star Wars: The Force Unleashed (2008) was released. Both this series and the game introduced an apprentice (Ashoka in the series and Starkiller in the game) to Anakin/Darth Vader. Both apprentices hold their lightsabers in the Shien reverse grip. The year Star Wars: The Force Unleashed II (2010) was released both Starkiller's clone and Ashoka began duel wielding lightsabers. Sam Witwer voiced both Darth Maul on this series and Starkiller in the games, who also share several similarities.
When Matt Lanter auditioned for the part of Anakin Skywalker, he was told he was up for the part of "Deak Starkiller". Director Dave Filoni and producer Catherine Winder then told him to play a combination of Han Solo and Luke Skywalker.
Captain Rex is based on Dark Horse comics ARC Trooper Alpha. But on realizing there were already three other characters who's name started with A (Anakin, Artoo and Ahsoka), George Lucas proposed the name 'Rex' instead.
Dave Filoni and first season head writer Henry Gilroy had originally assumed that Obi-Wan and Anakin would only make occasional appearances on the show because most of their Clone Wars activities had already been told in printed work and in Star Wars: Clone Wars (2003). Instead, the main characters were to be a Twi'lek Jedi called Sendak and his Togruta apprentice Ashla (later to become Ahsoka) who fought piracy and mercenaries around the galaxy. They would team up with a Han Solo like smuggler called Cad, his mistress Lupé and their Gungan strongman Lunker. Another idea was to stick to a couple of recurring locations, not unlike the TV show Firefly (2002) and keep landscapes to a minimum for rendering and conceptualization reasons. However, they soon found out that George Lucas didn't intend to keep The Clone Wars small.
Season six was in production when Lucasfilm's new owners Disney cancelled the show a week after the last episode aired. Thirteen episodes were completed at the time of cancellation while four were partially finished as it was rendered in animatic form despite the voice actors already recorded their lines. These episodes (except the four partly completed episodes) was eventually aired on Netflix in 2014, while several unresolved storylines will be continued in a continuation project called The Clone Wars Legacy, which are comprised of novels and comic books.
Nightsisters (#3.12), Monsters (#3.13) and Witches of the Mist (#3.14) was not the only appearances of the Nightsister Sith witches in the Star Wars universe. In the 1985 spin-off film "Ewoks: The Battle for Endor" Charal is a Nightsister and in the 1994 novel "The Courtship of Leia" by Dave Wolverton, Luke Skywalker is captured by a Nightsister.
It was rumored George Takei (The voice of Lok Durd) would be starring in JJ Abrams's "Star Wars: Episode 7 - The Force Awakens" as Jedi Master Seti Maru. George Takei was famous for playing Hikaru Sulu in the original series and feature films of "Star Trek", which John Cho succeeded George Takei in the role for the 2009 reboot and it's sequel "Star Trek: Into Darkness" directed by JJ Abrams.
Hondo Ohnaka was described as "Han Solo, Captain Jack Sparrow and Boba Fett rolled into one". Keira Knightley, whom played Elizabeth Swan in the "Pirates of the Caribbean" films, played Sabe, Queen Amidala's handmaiden in "Star Wars: Episode I - The Phantom Menace".
The trivia items below may give away important plot points.
When the series first started, there was a lot of rumors and speculations on the fate of Ahsoka Tano, whom doesn't appear and is not mentioned in "Star Wars: Episode III - Revenge of the Sith" and it was speculated Ahsoka Tano died prior to "Episode III". In The Wrong Jedi (#5.20), it is revealed Ahsoka turns in her lightsaber and leaves the Jedi Order. It was rumored Ahsoka Tano may appear in "Star Wars: Rebels" and it is also possible and could be likely, Ahsoka Tano may appear in "Star Wars: Episode 8" and "Star Wars: Episode 9" and she may not had been hunted down and killed by Darth Vader and his apprentice Darth Starkiller (See "Star Wars: The Force Unleashed"). Eventually in the season one finale of ''Star Wars: Rebels'', the mysterious informant was revealed to be none other than Ahsoka herself.