Level 1: Dodging bullets:
While on the level 1, there will be a hail of bullets. To dodge them, hold L and run around. The chances of you getting hit will be decreased.

Midnight the cat:
When Catwoman comes across this little feline she is in luck. Finding Midnight gives Catwoman nine lives.

Vault Code:
The code to unlock the vault is 1940 which is the year that Catwoman first appeared in the comics. This will unlock new galleries as well as a new comic book cover.