Continuity mistake: When Count Dooku is speaking to Riff Tamson via hologram, the clasp of Dooku's cloak is missing in one shot. (00:00:57)
Audio problem: In the Swedish release, the language suddenly switches to Danish, then back to Swedish again. This is according to the DVD copy I have of Season 4 Volume 1. (00:08:41)
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)
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)
Revealing mistake: When Grievous falls to the ground as the Gungans throw plasma balls at him, the lance General Tarpals stuck through his torso blatantly clips through the ground. (00:15:03)
Character mistake: When Queen Neeyutnee thanks Jar Jar at the end, she erroneously refers to him as "Senator" Binks (he's a representative). (00:21:46)
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)
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: Pong Krell's goatee is missing during the conversation he has with Rex during the march, most noticeably when he says "CT-7567, are you reading me?" (00:13:25)
The General - S4-E8
Continuity mistake: When the 501st are pushing towards the Umbaran Airbase, most of the injured clones Kix drags away are missing their 501st markings, then in the next shot, they have the markings. (00:01:28)
The General - S4-E8
Continuity mistake: Pong Krell's goatee is missing at the end, when he accepts Rex's report that the base has been successfully captured. (00:21:02)
Continuity mistake: When Fives is telling Rex he, Jesse and Hardcase are going through with their plan, Jesse and Hardcase switch places. (00:12:26)
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 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)
Continuity mistake: When Rex releases Fives and Jesse from the brig, Fives' kama is missing as he stands up. (00:11:00)
Continuity mistake: When Krell jumps out of the tower window, his blue lightsaber is in his right hand, but when he lands, his sabers have swapped hands, with the green one in his right instead. (00:12:21)
Continuity mistake: Tup attracts Krell's attention by firing two shots at him, but Krell is then seen deflecting three blaster bolts. (00:15:41)
Continuity mistake: When Rex begins to question Krell in the brig, Fives' kama is missing. (00:16:55)
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)
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)
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.