As you play through Chapter 11, Nate and Sam will stumble across an unfamiliar portrait of a pirate that has the sigil of a monkey with a poison dagger and an hourglass. Then in Chapter 14, you'll see portraits of the founders in Libertalia's bank. One of them has most of his name obscured on the frame, but it starts with a "G." These are references to Guybrush Threepwood, the star of the classic LucasArts adventure titles set on Monkey Island.