Dead Rising - Empty Bathroom

In the Wonderland Plaza, if you run into the bathroom where the shortcut to Paradise Plaza is fast enough (After coming from another area, particularly the Food Court) The toilets and sinks won't load before you get there and it will look empty for a few seconds.

Dead Rising - Escaping crowds of zombies

Once unlocked, you can use the jump kick to knock several zombies out of your way.

Dead Rising - Katana and Battle Axe

In the upstairs part of the entrance plaza, there is a store that has both katanas and battle axes. This is the closest store to the security room that has these weapons.

Dead Rising - Using the sledgehammer

If you get a sledgehammer (from the warehouse or from a hardware store) you may not realize it has two attacks. The first attack is a slamming the hammer down towards an enemy, sometimes beheading them which works great for a single opponent, but you can also hold x down to swing the hammer around, hitting several enemies at once with less damage.