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Cheat mode:
Select "Bonuses" at the main menu. Then select "Cheats", go down, then enter the following passwords. To enable the cheats, press Start to pause game play, select "Cheats", go down, then press X to activate a cheat.

Carl wears Muntz's aviator goggles:
Enter AVIATORGOGGLES as a code.

Russell attracts all butterflies:
Enter BUTTERFLY as a code.
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Carl jumps from the teeter totter to lift Russell end up in the air:
Enter CARLHEAVYWEIGHT as a code.

Carl creates multicoloured balloons when he jumps:
Enter BALLOONPARTY as a code.