And what about Uncle Tom Cobbley's companions? I remembered them fairly easily, but I never did know the names of the Magnificent Seven.

Thompson's "a wart in Heaven" reminds me of something I always find annoying - people pronouncing Saint John's wort as if it is "Saint John's wart". I always imagine Saint John with a big wart on his nose.
For the pronunciation of "wort", think of worm, and worth, and word, and work, an worse ...