Grim Fandango reference...
	Maniac Mansion 2 reference...
	Sam And Max series reference...
	Trophies...

In Le Chuck's lair, look closely at the pillars made from skulls. One of the faces is that of Manny Calavera's head.

Play the game in Special Style mode and go to the monkey head entrance. You can see a Purple Tentacle idol.

Play the game in Classic Style mode and go to the monkey head entrance. You can see a Sam and Max idols.

Complete the following tasks to unlock PlayStation 3 trophy rewards.

Trophy	How to unlock
Determined ( Bronze )	Don't use any hints to finish the game.
Escape Artist ( Bronze )	Escape from the Monkey Island Cannibals' hut 5 times.
Guybrush Kicks Butt ( Gold )	Complete Last Part: Guybrush Kicks Butt.
Human Cannonball ( Bronze )	Finish the entire game in under 3 hours.
Marooned Everyone ( Bronze )	Use one save slot to play both endings.
Old School ( Bronze )	Switch to classic mode at least once.
Recordkeeper ( Bronze )	Collect all of the notes and memos on Monkey Island.
Sharp Tongue ( Silver )	Learn all of the insults from the pirates.
Ten Minutes Later... ( Bronze )	Have Guybrush drown.
The Journey ( Silver )	Complete Part Two: The Journey
The Three Trials ( Silver )	Complete Part One: The Three Trials.
Under Monkey Island ( Silver )	Complete Part Three: Under Monkey Island.