Unlock->Info screen animation should be reversed
The spatial model of the lock screen is that the "info" screen with time, date, etc. is above the "unlock" screen with the keypad. When going from info to unlock, the animation reflects this correctly (both screens move up), but when going back to info, the info screen comes back in from the bottom. In order to keep the spatial model consistent this should be reversed, i.e. both screens should move back down, the opposite of the info->unlock animation.
I had a quick look at the code but couldn't find an easy way to flip it. I think it should be transition type on the stack.