What is an allusion in "American Draft Dodger in Thunder Bay"

What is the main purpose of a speech bubble in a graphic novel ?

What distinguishes the dialogue of this excerpt most clearly as a work of the postmodern era?

You suspect that this article has left out some facts that might lead the reader to believe that someone else made the star-spangled banner. what is the best way to verify this? by consulting a variety of sources by disregarding the article entirely by writing a letter to the editor of the publication that printed the article by reading various historical accounts by verifying the opinions