Revealing mistake: When Ahsoka and Master Sinube are on their way to Ione Marcy's apartment, Ahsoka's sash keeps clipping through the bottom of her skirt. (00:09:25)
Other mistake: Obi-Wan Kenobi discovers the Mandalorians and gets into a fist fight with them, punching one in the face a few times, who reacts with obvious discomfort. But the one hit is wearing Mandalorian armour, famously resistant to all kinds of weaponry, and Obi-Wan is barehanded! The Mandalorian should be laughing off his attempts. Not to mention that later he surprises another armed guard in Mandalorian armour and knocks him out with two barehanded blows to the helmet.
Suggested correction: It must be pointed out that unlike the Mandos he's fighting, Obi-Wan explicitly has supernatural powers, powers that most certainly help with things like punching out people in full armour. Seeing this as a "mistake" is kind of ridiculous in a space fantasy series.
Continuity mistake: When Mixer and Redeye are first seen patrolling the Coronet's hold, their armour markings are visible in the first shot, but in the second, their armour is suddenly plain. (00:01:42)
Continuity mistake: When Anakin is facing down one of the assassin droids, after it throws Redeye's body at him, he and the droid are suddenly in a different part of the cargo hold, with fewer crates around them. (00:09:04)
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)
Continuity mistake: Satine and her guards along everyone else who entered the shuttle at the end of the episode disappear - you can easily see inside the shuttle and through the other window.
Continuity mistake: When Satine is falsely identified as a suspect in a shooting, she pulls her hand with her holdout pistol under her cloak, but when two police droids approach, her hand is back out again. (00:11:23)
Continuity mistake: When Padmé and Bail are walking down the hall after the Senate vote, the top of her right sleeve is miscoloured, with the purple section extending further down than it should on that outfit. (00:21:02)
Continuity mistake: When Mace and Ponds have the exchange that ends with the Jedi General dropping "I have a bad feeling about this", Ponds' kama (kilt) has a blue border instead of the usual maroon to match his armour. (00:08:43)
Continuity mistake: When the Chancellor is being briefed on The Zillo Beast, Rex's kama is missing. (00:14:12)
Audio problem: When Anakin says, "What? Uh-oh," his mouth does not move. He just looks shocked that his lightsaber could not cut The Zillo Beast.
Death Trap - S2-E20
Continuity mistake: When the alarm goes off, Sergeant Crasher tells his cadets that there's been an explosion and that they'll show the crew how the Clone Youth Brigade does things. As he's saying this, the camera cuts from him to a closeup of Hotshot before back to Crasher, who is walking through the same group of cadets in the exact same way in both shots. (00:10:36)
Death Trap - S2-E20
Continuity mistake: When Commander Ponds orders some other clone troopers to evacuate because he's staying onboard with the Admiral, his kama (kilt) is missing, and his blaster pistols are missing from his holsters. (00:16:46)
Continuity mistake: The canopies of Anakin and Mace's starfighters appear different than they did in the previous episode, now possessing an opaque rim around the outside.
Continuity mistake: Plo's lightsaber vanishes from his belt between shots when he takes Boba over to Hondo to see if the pirate can persuade the boy to reveal the location of the hostages. (00:19:05)
Clone Cadets - S3-E1
Continuity mistake: During the first training test, when Fives and Cutup have an exchange where the former tells the latter to flank right and gets a bad pun in response, Cutup is wearing Echo's practice armour (with a number 3 on it) instead of his own, which is marked with a 4. (00:10:38)
Continuity mistake: When Anakin and Padmé are walking towards her ship while discussing the situation, as happens with surprising frequency, Rex, walking behind them, is missing his kama (the kilt). (00:04:35)
Continuity mistake: When Ahsoka suggests that Chairman Papanoida's daughters might be being held on the Trade Federation ship blockading Pantora, she refers to it as a planet. "Trespass" established that Pantora is a moon. (00:06:47)
Continuity mistake: When Baron Papanoida walks into Jabba's court, his half-cape is missing. (00:10:24)
The Academy - S3-E6
Plot hole: When Ahsoka rushes to save the students when they arrive to meet the prime minister, she attacks several secret police officers, who flee afterwards. However, we later see her standing next to the prime minister acting innocent when she pretends to side with him. The officers she fought earlier would no doubt have told Almec what side Ahsoka is really on, so her ploy never should have worked to begin with. (00:11:55 - 00:13:40)