All XKCD comics have individual threads in the XKCD forums which discuss the various comics.
There is also an Explain XKCD wiki which can help. (Thanks to @alex_d).
From perusing the thread:
- Wandboy = Harry Potter
- Puncher = Rocky
- Tropical Boaters = Pirates of the Caribbean
- Professor Whip = Indiana Jones
Additionally, every XKCD comic has title text for it, which you can see if you hold your mouse over the image.
See if you can figure what what's being referenced in the text for this one:
There's also the TV show based on the hit Hot and Cold Music books: Fun With Chairs, Royal Rumble, Knife Blizzard, Breakfast for Birds, and Samba Serpents.
Note: if you're going to answer the quoted text in a comment, be sure to use spoiler formatting.
In case you're wondering, the answer is:
The A Song of Ice and Fire book series: A Game of Thrones, A Clash of Kings, A Storm of Swords, A Feast for Crows and A Dance with Dragons