Cheat mode:
Hold L hard + R light + Left + Y then press Start during game play. A cheat menu with 
Invincibility and Level Warp options will be unlocked. 

All feats and spells:
Hold L hard + R light + X + Right during game play. 
Note: This will reduce your character's statistics. 

Play as Drizzt:
Select "New Game" at the main menu, select one of the three default characters, then 
hold L + R until the game completes loading. 

It won't show it, but no matter what character you pick, you will see Drizzt walk into 
Baldurs Gate and get attacked.  It doesn't work when starting a new character from the 
import screen, and any game containing Drizzt cannot be loaded or imported from, until 
extreme mode had been completed.
Submitted by eagle74z 

Control loading screen:
Move the Right Analog-stick and the flames surrounding "Loading" will also move.