Pounds Are Animal Prisons: Invoked in reverse by Batman when he captures Daggett's mooks and tells them they're on their way to "the pound".
Snow Means Love: Batman meets Catwoman in the snow, and she has to ask, "Are you getting soft on criminals, or just on me?"
The Unmasking: At the beginning, Catwoman is arrested and in the aftermath is outed as Selina Kyle and put on probation — if Catwoman is sighted, Selina is to be arrested immediately. However, this is the only episode to actually use this plot point in any way. Either the writers forgot or Selina is just that good.