Old Friends Not Forgotten - S7-E9
Revealing mistake: When Anakin says to Obi-Wan that if they do things his way they can help the people in the city now, his hair is blowing in the wind, and the locks by his forehead are obviously clipping into his head. (00:02:42)
Old Friends Not Forgotten - S7-E9
Continuity mistake: When Cody is telling Obi-Wan about the tactical droid remaining out of sight, the armour accessory he wears on his back is missing. (00:02:05)
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)
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)
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)
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.