Avoiding cops:
If the cops are after you and you cannot lose them, go to Rusty's scrap yard. When you land or park, the cops will give up looking for you.

Easy money:
Use the Great Database and change into the head banker; his powers allow you to get money from more than one robot at once.

Opening the bridge:
On level 2, to open the bridge there are four switches. Press switches 1, 2, and 4.

Weird Wild West: Safe code:
The safe which is in the bank has a three digit code. The code is "1-3-5".

Mini-games:
Get the five hidden sandwich ingredients in a level to unlock a mini-game.
Trap The Fake Ghost mini-game mini-game: Collect the ingredients in level 1.
Monster Frenzy mini-game: Collect the ingredients in level 2.
Mine Cart mini-game: Collect the ingredients in level 3.
Trail Bike mini-game mini-game: Collect the ingredients in level 4.
Spooky Science mini-game: Collect the ingredients in level 5.

Bat Costume:
Fly as high as you can and press B.

All FMV sequences:
Pause game play then hold L R and quickly press X(3), B(3), X, B, X.

All power-ups:
Pause game play then hold L R and quickly press B, X, B, X, B, X(3), B(2), X, B(3).

All warp gates:
Pause game play then hold L R and quickly press X(2), B, X(2), B, X, B(3).

Dark And Stormy Night Part 2: Help from Shaggy:
If you die after getting all the keys and having Shaggy up in the coffins, when you restart the level you can talk to an invisible Shaggy and still have him help you jump and walk around in his arms. You can take him all the way through the level to the doorway.

Background gallery:
Successfully complete the game on the normal difficulty setting to unlock the background
gallery.

Model gallery:
Successfully complete the game on the hard difficulty setting to unlock the model gallery.

Sketch gallery:
Successfully complete the game on the easy difficulty setting to unlock the sketch gallery.