Maven's shoes look different from her last appearance in The Cat and the Claw.
Isis bites Catwoman on her left hand, but later when Batman tends to Catwoman, the bite marks are on her right hand.
When Batman bursts up from the frozen lake, with the two captured villains in tow, the villains disappear for a moment, and then reappear into view. The animation doesn't show them sinking and surfacing, they simply vanish from one frame to the next.