Deliberate mistake: Pre Vizsla's appearance in the hologram doesn't match up with his appearance in the previous and succeeding episodes, as he's wearing clone armour covered with a cloak that has a different symbol on it. This is because when this episode was being produced, Vizsla's final character model wasn't complete yet. (00:16:25)
Star Wars: The Clone Wars (2008)
1 deliberate mistake in Voyage of Temptation
Starring: Dee Bradley Baker, Matt Lanter, James Arnold Taylor, Tom Kane
Mystery of a Thousand Moons - S1-E18
Continuity mistake: In the previous episode, the Republic troops blasted huge holes into the Separatist lab to enter it. In this episode, in which the highly contagious airborne virus is unleashed into the facility, the holes are conveniently nowhere to be seen, so it can't get loose onto Naboo.
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: Did Darth Maul's return in this series cause big controversy among Star Wars fans?
Answer: I would say his death in Phantom Menace was more of a controversy. He was a fan favorite character from the movie, and his fight scene largely regarded as the best part of the movie. It was more he was brought back to please the Star Wars fans and few, if any, had problems with it.