At the end of the closing credits, Harley is heard asking the audience if they're still around, and then decides to reward them with a secret about Batman. But before she can do so, the film ends.
The DC Comics logo gets a frowny face scribbled on it in pink.
The film title appears above the burning Ace Chemicals plant.
Part of the closing credits are set around a stylized version of the Booby Trap funhouse.