Easy money:  Get Earl and buy some sushi to go. Then, grab all the sushi and sell it to the shop keeper. Note: Do this on the ice area.

Black Belt:  In the urban area, get first place in the spring gate battle to earn the black belt.

Freeze Earthlings:  Press B button repeatedly to open and close your presents menu. This will freeze any Earthlings as long as this is being done. Note: You must have at least one present for this to work.

Warp back to partner:  In two player mode, if you fall off the edge of the land, press White open the map. Then, press A to warp back to your partner. Note: Your partner must be alive for this to work.

Toejam impervious to Hell:  If you are Latisha or Earl and fall in Hell, you will get hurt slightly. However, if you are Toejam, no damage will count against you.

Upgrades:

Drop an Identify by a snowman and you will get an Identify All.
Drop an Extra Bucks by a trash can and you will get a Jackpot.
Drop a Jackpot by a totem pole and you get a Super Notes.
Drop a Food by a picnic table and you get an Orgasmic Food.

Extend timers:  Open Extra Bucks or Jackpot presents to extend your timers.

Shoot notes from the air:  Open Funkify Notes while flying to shoot notes from the air before you can normally do so (by reaching the Homey rank).

Stronger decoy:  Open any food (or Sushi) while standing next to a decoy.

Double Points  -  If you are doing something to funkify earthlings (i.e. rhythm matching, Funk Fu Blast, etc.), open an Instant Points present to receive double points for funkified earthlings.

Extend timers  -  Open Extra Bucks or Jackpot presents to extend your timers.

Icarus/Funkify Combo  -  Open Icarus Wings and then open Funkify Notes present and you will be able to shoot funkify notes while flying.

Instant Demotion Present  -  An Instant Demotion present is not necessarily bad if it is opened while near the wiseman in the carrot suit. After opening the present, you will be demoted in rank but the carrot suit guy will promote you again allowing you to earn an extra life like you did the first time you were promoted. In 2 player mode, open the Instant Demotion while both players are on the same screen and you can earn 2 extra lives.

Sleeping Earthlings  -  Sneak up on a sleeping earthling by walking (pushing lightly on the thumbstick). When you get by the earthling, hit the black button. You will scream "Wake Up!" and cause the earthling to fall off the edge and also drop presents and money. This works well on sleeping dentists.

Stand in air  -  Enter any level and find the elevator. Get on top of the elevator by jumping. This may take several attempts. Once on top of the elevator, slowly walk off either the front or back. You will now be standing in mid-air but can do all of the same things you can do on land such as funkify notes and funk-fu. This is a good way of gaining protection. Note: You will not be able to walk very far before falling down.