This is not to say that Emily is wrong in any way (lord please don't get me on record saying she is wrong, because that COULDN'T happen). but maybe that there is a miniscule detail that she may have neglected to mention.
** SPOILER WARNING **
The most important detail of the NAME Rant, is the origin story of the book. As Emily mentioned, it is a very entertaining book, that falls apart at the end. But the reason that Buster Casey is called Rant is because of the local church Halloween party.
When Buster, an enterprising young lad of age 10 or 11(details escape me, its been 6 months since I read it) heard that the local church haunted house event would require Cow's Eyeballs, Brains, and Pig Hearts, he was thoroughly disappointed to discover that through the magic of parental lies, the incredible tactile sensation that they had grown up with, was all a lie. Peeled grapes, jello, and cooked spaghetti were the explanation that broke his heart with the same force of discovering dear Santa was just a figment. So the following year, when he became rich through a scheme too long to recount here, he decides to go the the butcher in the next town over. As you can imagine, the bloody mess that ensues that Halloween is visceral. The image of the blood and gore on the freshly stripped church floors (hardwood of course), is compounded by the reactionary regurgitation of all of the members of the congregation. And the sound that they all made... repeatedly.
This is how Buster "Rant" Casey, got his name.
and this is why I don't want to buy a Verizon "Rant" phone.