Continuity mistake: When Cad Bane is taken into custody by a clone trooper, the trooper changes from a shock trooper to a standard trooper between shots. (00:14:40)
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.





Answer: Dooku never accepted Ventress as his apprentice, as far as I know; he just kept her as his devoted personal assassin. In Phantom Menace, it is stated that there can be only two Sith at a time, to prevent a power struggle in the lower ranks. To accept Ventress as an apprentice, Dooku would have violated that rule.