Collect the indicated items to get extra points. Note: They will not appear in your inventory.

Chapter 1 (Bell): In the room with the three bells, slide underneath the lowest one. Jump up into it and the bell will drop down to your left.
Chapter 2 (Crown): Hit the following keys on the piano (counting from the right): 5 white, 5 black, 6 white, 5 white, 2 black, 5 white, 5 black, 6 white.
Chapter 3 (Moai): Wake the Boss and let him clear the room. Then, jump kick through the center of the vortex in the background and the Moai will appear there.
Chapter 4 (Goemon): Find the a small dark alcove jutting out of the wall at the right side of the level. Enter it and the Goemon will appear to your left.
Chapter 5 (Vic Viper): Enter the top right corner of the right building and tap Up. Vic Viper will fly across above the building from the right.
Chapter 6 (Konami Man): Jump up next to the blue roof before the final staircase and tap Up. Konami Man will fly in from the right and just above you.
Chapter 7 (Vick13): Go to the top of the pyramid, then jump.
Chapter 8 (Lucky Cat): Go to the top-right room of the level and press Down in the cave area. The Lucky Cat can be found to your left.
Chapter 9 (Twin Bee): Get on top of the left-most tower and go down along the barbed wire. Land on the platform below the first guillotine and the Twin Bee will appear back above.
Chapter 10 (Crown): Break the wall to the right in the first room with the spear guards and walk through. The Crown will appear in the room behind you.
Chapter 11 (Facade Card): Stand on top of the tree stump and jump straight up in the room directly above the Boss. The Facade Card will appear to your left.