Other mistake: When Cad Bane orders one of the commando droids disguised as a Senate Commando to finish clearing the platform, the neck area below the helmet shows human skin even though there's now a droid inside the armour. (00:02:07)
Star Wars: The Clone Wars (2008)
1 other mistake in Hostage Crisis - chronological order
Starring: Dee Bradley Baker, Matt Lanter, James Arnold Taylor, Tom Kane
Deliberate mistake: At the beginning, Asajj Ventress is wearing an outfit with a long skirt. When she is rescued from her damaged starfighter by the scavengers, the skirt has vanished. This was done because the animators found the skirt too difficult to animate. This is also why she receives a brand new outfit that never had a long skirt later in the episode. (00:08:20)
Mystery of a Thousand Moons - S1-E18
Obi-Wan: Very impressive. You just destroyed seventeen defenseless battle droids without suffering a scratch.
[Another battle droid falls apart.]
Anakin: Eighteen, actually.
Trivia: In S5-E1, Savage kills the Jedi with Obi-Wan. However, in S5-E2, she is sitting as part of the Jedi Council.
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Suggested correction: I know there was talk about whether this is a legitimate mistake or a trivia entry. The episodes were simply aired out of order. "A War on Two Fronts" was supposed to be the season premiere, but they ended up airing "Revival" instead. On the DVD, the episodes are ordered chronologically, and "Revival" is placed later between what's regarded on IMDb as episode 13 and 14.
Question: Has Dooku ever officially made Asajj his apprentice? I know he is still Sidious' apprentice, but Sidious secretly trained Maul before he killed Plageous (according to the SW Wikipedia), so Dooku could secretly train Asajj. In "Ambush" he calls Asajj his apprentice when talking to the king of Toydaria, but then in "Cloak of Darkness", he tells Asajj that she has to prove she is worthy.
Answer: Dooku never accepted Ventress as his apprentice, as far as I know; he just kept her as his devoted personal assassin. In Phantom Menace, it is stated that there can be only two Sith at a time, to prevent a power struggle in the lower ranks. To accept Ventress as an apprentice, Dooku would have violated that rule.