Continuity mistake: When Cody comes out of the turbolift with Slick, he's carrying a plain white helmet instead of his regular customized one. (00:00:49)
The Citadel - S3-E18
Continuity mistake: Just after Ahsoka says "clear" when they're sneaking around the prison, her Padawan braid is missing again. (00:13:40)
Continuity mistake: When Ahsoka takes cover in the trees after the Trandoshan ship opens fire, her Padawan braid is missing. (00:07:05)
Continuity mistake: When Ahsoka is boarding the rescue gunship, her normally green lightsaber has a blue blade. (00:18:00)
Continuity mistake: When the Chancellor is being briefed on The Zillo Beast, Rex's kama is missing. (00:14:12)
Continuity mistake: When Dooku Force-throws some cutlery and dishes at Anakin, he gets a fork and a knife stuck in his prosthetic arm, but when he pulls them out, there is no damage to the protective glove he wears over it.
Continuity mistake: When Wrecker pulls Rex off Crosshair after the former attacks the latter for making insensitive remarks about Echo's presumed death, Rex's kama (kilt) is missing in the close-up shot. (00:14:10)
On the Wings of Keeradaks - S7-E3
Continuity mistake: When several of the clones are climbing up the ventilation shaft, Rex's kama (kilt) is missing. (00:04:17)
Continuity mistake: When Jesse and Crosshair are glaring at each other onboard the gunship, Kix has his right arm raised to grab hold of one of the handholds. When Jesse starts forward after Crosshair calls him a "reg", Kix's arm is suddenly down, but when Cody tells everyone to cut the chatter, Kix's arm is raised again. (00:07:00)
Other mistake: When Anakin is fighting some commando droids he suddenly has two lightsabers, one that he is actively using and another on his belt. (00:06:11)
Continuity mistake: When Hunter, Wrecker and Jesse are holding off droids at the cyber centre's front entrance just before they're forced to retreat inside the facility, Jesse's kama (kilt) is missing when he briefly emerges from behind a stack of crates to fire at the droids. (00:21:12)
Continuity mistake: The old photo Rex has of himself, Cody, Fives and Echo shows Cody and Rex wearing Phase II clone armour. This is even though the picture must have been taken before the events of season 3's Citadel arc that included Echo's presumed death, and Phase II armour wasn't introduced onto the show until season 4.
Continuity mistake: After Rako Hardeen orders a drink at a cantina, when the bartender pulls a bottle out from under the bar, it's corked when he takes it out and raises it to pour, but the cork is suddenly missing when he's pouring, although he didn't stop to take the cork out. (00:04:00)
Continuity mistake: When Queen Miraj gets angry with Atai and Count Dooku, she throws her glass to the floor and the sound of shattering is heard. But after Anakin arrives, the glass is lying on the floor unbroken. (00:09:10)
Slaves of the Republic - S4-E12
Continuity mistake: When Ahsoka threatens Queen Miraj, she's holding her primary lightsaber. When she's shocked unconscious and falls to the ground, it's her smaller shoto that rolls onto the floor. (00:14:44)
Nomad Droids - S4-E6
Continuity mistake: During the incinerator scene, there are two RA-7 protocol droids seen. When the first one attempts to run from the incinerator, the one behind it has vanished, only to reappear in the next scene. (00:20:24)
Continuity mistake: While training Savage, Dooku uses the Force to levitate a number of stone obelisks. While he's doing that, there's a closeup of Savage where an obelisk that is shown floating in the preceding and successive shots is visible behind him not floating. (00:03:36)
The Citadel - S3-E18
Continuity mistake: When the commando droids enter the cell where Piell's officers were being held, the damage on the door from Anakin stabbing a commando droid with his lightsaber through it is gone. (00:19:20)
The Citadel - S3-E18
Continuity mistake: When Ahsoka asks Master Plo if she can speak with him, her Padawan braid (the beaded chain hanging on the back of her head below her right horn) is missing. (00:04:05)
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)
Answer: I guess that 1) the King assumed that Ventress' droids were meant to capture the Jedi, not kill him outright. When she yells at OOM-224 to shoot Yoda, she evidently failed that expectation. 2) Sending out a bunch of Droidekas after it is plain that Master Yoda has clearly won is not a sign of good sportsmanship, either.