In the teaser of the previous episode, you see Batman, Robin, Batgirl, Commissioner Gordon, and Chief O'Hara witness Catwoman driving away with the Joker in her car. However, in the beginning of this episode, you see Joker being released from prison, witnessed by Bruce Wayne (Batman) and Warden Crichton. Then, Catwoman picks up the Joker in her car and drives away in the same teaser scene as seen previously.
The position and orientation of Catwoman's hands change between shots when she's revealing her master plan to Joker.
When Batgirl is secretly using Commissioner Gordon's red Batphone to contact Batman, she tells him to meet her at the house of Little Louie Groovy. Batman (Bruce Wayne) repeats back the name into the phone, and then Dick Grayson says, "Gosh Bruce, I've always wanted to meet him!" If Batgirl heard this, she would know the identity of Batman as neither Batman/Robin know the true identity of Batgirl and vice versa.