While on Monkey Island, you can use the phone on the tree to call the LucasArts Games Hint Line. One of the questions you can ask the clerk is "who thought up that dumb stump joke?" The clerk responds with "I'm tired of hearing about that damn stump. Do you have any idea how many calls I get a DAY about that? Don't ask me about it again." This refers to an infamous joke in The Secret of Monkey Island: Special Edition (1990), where Guybrush notices a hole in a tree stump, which (he says) leads to a vast maze of caverns below. When the player tries to climb through, the game asks to insert non-existing game discs, and after unsuccessful attempts, Guybrush gives up. The joke was lost on many players, who flooded the Hint Line thinking this was a technical error instead of a deliberate joke.
The game contains a large number of visual references to the "Pirates Of The Carribean" ride at Disneyland, as well as at least one puzzle inspired by the ride's famous Jail Cell/Dog With Keys scene. "Pirates Of The Carribean" was a huge inspiration for Ron Gilbert in developing the ambiance of the first two Monkey Island games. Gilbert's other big inspiration was the book "On Stranger Tides" by Tim Powers.