I loved that you have to get in line for looting the Governor’s mansion, but then the clock actually never advances (and Guybrush comments on it).
And the fact that the Swordmaster has a bunch of T-Shirts ready for the people who have defeated her.
Rnlf already mentioned the way to get the navigator’s head, but also what’s great is that the two other books are “How to arm yourself in combat” and “How to get a leg up in treasure hunting” which is a great way to name a trilogy.