The Ledge
Map: The Mill
Prize: Weapon #2, Chaos Device

This is a tricky jump, but it can be made by pressing forward and strafing left at the same time. Time it just right from the top of the bush and you can make it up there. Be sure to grab both items.

The Wall
Map: Barbican
Prize: Glyph of the Ancient

After launching yourself from the catapult, try controlling your flight. If you do it just right, you'll drop on the top of the wall where you can grab some goodies.

The Secret Passage
Map: Barbican
Prize: Bracers, Chaos Device

This is near where you drop back down into the moat to transform the mithril door. There's a Skull Wizard nearby. Smash the bookshelf and step on the floorplate to open a secret passage.

The Tower
Map: King's Court
Prize: 2 Quartz Flasks, Breastplate

There is a teleporter hidden in one of the shops that will get you into the tower at the beginning of The King's Court. Go into the Raven's Nest shop and smash the shelf, revealing the teleporter hidden underneath the stairs.

The Stables
Map: Stables
Prize: Staff of the Ovinomancer

Near the door unlocked by the stables key, find a room with a couple of bunk beds. Climb up the one and hop across to the ledge in front of the mural of Famine. The mural will slide open.