Lego Island 2: The Brickster's Revenge Codes and Secrets (PC)

Lego Island 2: The Brickster's Revenge is an adventure computer game, it is the sequel to Lego Island. After the Brickster is re-captured, the Infomaniac leaves to Block City for a business meeting, and sends his sensitive niece, Dimitria, to look after it. Pepper Roni is promised a new house, on condition that he delivers pizzas around the island. Having delivered enough pizzas to earn his new house, Pepper is told to deliver a pizza to the jail. The Brickster uses his hot breath saved from previous pizza chillies to form a spicy pizza to melt the jail doors to escape, stealing a police helicopter and flying to the Information Center.

He steals the Constructopedia, the book containing the blueprints for all buildings on the island, and then scatters its pages through space and time. All of the buildings on LEGO Island are deconstructed. Having summoned the 'Brickster-Bots' of Ogel, the Brickster leaves for Ogel Island. Pepper then has to destroy the Brickster Bots, using Pizza, and begins to locate a few of the pages. With each page returned, a building is re-constructed. (Wikipedia)

Codes

Make the Rabbits jump and butterflies follow you
In the area with rabbit holes and rabbits on Lego Island press "Shift" and they will jump. Do the same near butterflies and one of them will follow you.

Press Shift near butterfly - It follows you

Press "Shift" near rabbits - Rabbits jump

Easter Eggs

Meet and talk to the game developers.
After completing the game, go to the rocket ship. Run around and find a hole nearby. After you find it, type sdreams. A portal should appear at the hole. Go in and you will see the game's developers as Lego people. Talk to them to find out some interesting things.

Secrets

Become Invincible
When you are on the space mountain, jump off the highest point and the station master will pick you up, when he does hold "Space Bar" until he puts you down. You are now invincible.

The glitches you can encounter in the game are included in this video: