The Secret Of Monkey Island: Special Edition (PC)
Grim Fandango reference
In Le Chuck's lair, look closely at the pillars made from skulls. One of the faces is that of Manny Calavera's head.
Maniac Mansion 2 reference
Play the game in Special Style mode and go to the monkey head entrance. You can see a Purple Tentacle idol.
Sam And Max series reference
Play the game in Classic Style mode and go to the monkey head entrance. You can see a Sam and Max idols.
Strategy guides from GameFAQs