Comma placement before and after names

Comma misuse is nothing to take lightly. It can lead to a train wreck like this:

Example: Mark Twain's book, Tom Sawyer, is a delight.

Because of the commas, that sentence states that Twain wrote only one book. In fact, he wrote more than two dozen of them.

Source

Why is this sentence a trainwreck? What is the correct placement of commas to un-train-wreck it?

How about this?

Mark Twain's second book, Tom Sawyer, is a delight.

Solution 1:

The source would seem to suggest that the non-train-wreck version of that sentence would be:

Mark Twain's book Tom Sawyer is a delight.

I.e., simply remove the commas, since the sentence is specifically talking about the delightful nature of Tom Sawyer, among Mark Twain's many books, rather than Mark Twain's one-and-only book, as is implied when commas are used.