Continuity mistake: When Yoda arrives at Korriban, the wings of his starfighter open up when he flies down to the planet. However, in the second shot of him flying down, the wings are closed. (00:01:10)
Nomad Droids - S4-E6
Continuity mistake: At the end, when R2-D2 and C-3PO are reunited with Republic forces, Master Plo asks Commander Wolffe if he knows these droids. However, Plo previously encountered R2 in both "Rising Malevolence" and "R2 Come Home" (the latter episode having the same error).
Continuity mistake: When Rex is giving orders to the heavy cannons after the super-tanks emerge, his kama is missing.
Continuity mistake: Rex has a bandage on his left arm for the entirety of the episode after getting injured in the previous one. After Aayla destroys the probe droid, in a shot of her, Ahsoka, Rex and Bly walking over to the destroyed droid, the bandage is missing. (00:07:11)
Old Friends Not Forgotten - S7-E9
Revealing mistake: When Rex hands Anakin The Box with Ahsoka's lightsabers, his right thigh armour piece briefly clips through his kama twice. (00:12:58)
Revealing mistake: When Ahsoka and Rex walk onto the bridge of the Star Destroyer, in one shot the right part of his kama is partially transparent, revealing his thigh armour beneath it. (00:08:05)
Old Friends Not Forgotten - S7-E9
Continuity mistake: When Ahsoka and Rex watch from their gunship as another one is shot down on the approach to Sundari, his kama is missing. (00:18:24)
The Phantom Apprentice - S7-E10
Continuity mistake: When Ahsoka, Rex and Bo-Katan are watching the evacuation, Rex is holding his helmet under his left arm. When the three of them are going inside as Bo remarks that the occupation cannot last much longer, Rex is suddenly empty-handed. (00:13:27)
Old Friends Not Forgotten - S7-E9
Continuity mistake: When Bo-Katan storms the throne room, the pistol she's holding in her right hand is kicked out of her hand by one of the supercommandos. However, when she goes to fight Almec, there's a pistol in her right holster despite her not having had time to retrieve the weapon. (00:23:30)
Revealing mistake: When one of the Mandalorians snags Ahsoka's right wrist with a cable, it clips straight through her head and neck in the process. (00:15:46)
Continuity mistake: When Anakin and Ahsoka are pinned down behind cover by the sniper droids, the damage the droids' blaster shots on the walls the Jedi are hiding behind changes whenever it's shown. (00:14:26)
Continuity mistake: When Krell is getting in Fives' face about who is going to take the blame for Fives and Jesse disobeying orders, the markings on Jesse's armour are missing. (00:21:21)
Character mistake: When Jesse says that he's "really not liking this", Fives calls him Hardcase when he responds with "don't get an itchy trigger finger." (00:15:35)
Continuity mistake: When Tamson is mocking Lee-Char about asking Nossor Ri for help, Ahsoka has her lightsabers on her belt even though she was disarmed earlier when she and Lee-Char were captured. (00:13:16)
Continuity mistake: R2's squad of battle droids has three members. Yet in the climactic fighting of the previous episode, one of the droids was shown getting destroyed.
Continuity mistake: After Obi-Wan's group has abseiled down the wall of the prison, two of the clone troopers in armour are carrying Separatist blasters instead of the Republic-issue blasters they had before and after. (00:09:38)
Continuity mistake: When the possessed Ahsoka declares that Anakin will be forced to kill her and Force-pulls one of her lightsabers into her right hand, said hand changes positions between the wide shot and the following close-up. (00:12:28)
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)
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: 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)
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.