> After you defeat your opponent but before the Instant Replay begins, press and hold Kick+Free. When the Instant Replay starts, press Punch to rewind it.
(courtesy: GameFan)

> Before entering your credits, hold Punch+Kick.  Insert your coins, start a game, and select any mode.  You'll see a new costume option for both Kasumi and Ayame that you can select.
(courtesy: GameFan)